I think the answer is "all of the above." A favorite folksinger quoted as Yogi as saying, "In theory, there's no difference between practice and theory. But in practice, there is." In other words, we can talk about theoreticals and whether stackers and openers fit, but it also comes down to who the players are. And as some have pointed out, the schedule can also make a difference. I also appreciated the wisdom of matching innings to individuals to maximize their usage. So for example, using the pitchers currently on the roster, here's how I would approach the season. Berrios and Gibson each made 32 starts and about 195 innings. Injuries could happen, or they could go a little longer in games. The season is 186 days long, so if they stayed on every 5 days, they actually would be able to start 37 games. That's not realistic, both because people don't do that and because the off days wouldn't allow them to start that many times. I would start with a goal of about 34 starts each, which means an average of every 5.5 days. I would work through the schedule with those two guys, finding the right mixture of four and five days off that space out their starts. I would also not pitch them on back-to-back days, since they are the two guys most likely to give a long start and rest the bullpen. Odorizzi has consistently averaged about 165 innings the last five years. He's just sucked on the third time through the order. I would also try to get 34 starts from him, BUT always pull him after 18 batters. The exception for that is that if there are no runners on base, he gets to continue until he gives up a baserunner or finishes the inning. If he has a 1.20 WHIP, that means he's going to average 5 innings per game. More on that later. I would work through the schedule to find the right mixture of every fifth and every sixth day to get him his 34 starts. With 34 starts from each of those, that only leaves 60 starts. I think the next best starter is Pineda (actually, I think he could be better than Odorizzi, but I'm downgrading him for coming back from injury). He's been very durable when healthy, however. I look for 30 starts from him. As I work through the schedule around the first three, there will likely be good stretches of time when Pineda simply slots into a steady spot in the rotation. On several occasions in the midst of keeping the others on pace, there would an opportunity to skip him. Basically, he'd have about four skips, and perhaps one or two of these would line up nicely for a 10-day "tired arm" trip to the DL. And then the plan is for Mejia to get as many of the remaining starts as possible. Like Pineda, this is probably a mixture of skipping him a couple times and mini-trips to the DL. One important note on Pineda and Mejia. For the first 18 games of the season, they can get by on four starters. That essentially means that Mejia's 30 starts will cover over the final 144 games of the season, so he very likely would stay in rotation with the first three guys the whole year. Particularly with that caveat, it's likely possible to use Pineda's skips very strategically. During those skips, he could alternatively pitch a game or two from the bullpen. Second important note on those. If Mejia outpitches Pineda in spring training, those guys flip spots. Ah, but what about Romero. Well, I don't think you can slot him into the rotation at the beginning of the year and have any hope of him lasting the year on a full workload. So from the beginning of the year, I stack him after Odorizzi. In a perfectly ideal world, Odorizzi pitches 34 games x 5 innings and Romero pitches 34 x 4 innings, which gets him to 136 innings. In reality, he can pitch more innings than that. In reality, somebody from among those five starters will also get hurt. When that happens, Romero slides into that guy's slot and could get up into the 160-170 range if effective. Meanwhile, a Gonsalves, Stewart, Thorpe etc., dominate in Rochester, ready to slide in at a moment's notice to one of the spots. If there are times when the commitment to starts from the first three don't line up to have Mejia and Pineda get all of the remaining 60 starts, there might be occasion to bring up one of these guys for a spot start. So that would give us Gibson (195), Berrios (195), Odo (170), Mejia (150), Pineda (155 based on past durability), and Romero (use the 136, since if he gets more it would likely be at the expense of one of the first five. That gives you 991 innings from six roster spots, leaving us with 460 innings to get to the magic 1450. For those 460 innings, assume that the goal is to use and rest Rogers appropriately to get about 70. Similarly, target getting May around 70. If not abused, target Reed for 70. That leaves 250 innings and you've used nine spots with guys who can be effective. I'm not sure i want to trust Busenitz, Hildy, and the rest with that remaining 250, which is why I go after three relievers who can pitch 70 innings each. My first choice is David Robertson, though there are several other good ones. Then, Busenitz, Hildy, etc., are put in the position of covering for injuries, rather than being counted on for high-leverage stuff. That gives a 12-man staff that pitches 1410 of the 1450 innings. The other 40 come from 1) time during September when rosters are expanded; 2) the few times during the year when the staff has been stretched and they have to use the Rochester shuttle for a few games; and 3) a spot start or two from the minor league callups as described . But for the most part, the staff gets through the 25-man roster portion of the season with just 12 guys, leaving Rocco with a four-man bench at all times. Guys are going to get hurt, sure. But the point of my approach is to construct a pitching staff where there are 12 quality guys who COULD cover the 1450 innings. Then, the rookie starters and unproven relievers have demonstrated which of them are actually ready, rather than being counted on from the beginning. And that doesn't count the Justin Verlander-type midseason pickup, since this foolproof plan is guaranteed to have us contenders. When JVesqe comes on board, everybody slides down a notch. Same thing with the mid-season bullpen pickup if needed. Now, about the offense...