Every reliever, on every team, will end up pitching important innings. You can't just use the top 3 day after day and expect them to carry the load. Even if Odo and Gibson go 7, you still need bullpen coverage on those days, and every day the Twins play. Using only the top end in every close game is unworkable.
Good bullpens have multiple good arms, because all arms get used, and used in situations that matter.
Demanding more from the starters is a nice thought, but that was going to be difficult to achieve for this year's Twins team. However, adding bullpen arms was simple.
Let's start with 90 wins as our goal. Let's say we only get 6 innings out of our starters in all 90 of those games. That means we need 270 innings worth of bullpen usage in those games. If you have 4 guys who throw all of those innings they're all throwing 67.5 innings.
That's obviously a ridiculously perfect situation, but that's the plan you build for when you're a small to midmarket team because it's not sustainable to pay bullpen guys big money because they're too volatile. The argument I made in my post was you want 3 shut down type guys to lock down sure wins. Then you have 1 or 2 others are quite reliable. That's 4 or 5 guys. Yes, every guy in the pen will throw innings, but the plan is to use those 4 or 5 in the "important innings."
Good bullpens do have multiple good arms, 3-5 of them. They don't have 8 guys that they expect to use regularly in high leverage situations. They have 3-5 and then pop some of those other few in there in the 6th or 7th in stretches where the team is in a bunch of close games. But that's only a few stretches of the season. Vasquez was brutal last night, yes. But to act like the bullpen is just collapsing right now is inaccurate. Harper, Hildy, and May haven't allowed runs yet. Rogers and Parker have allowed 1. That's 2 runs in 21+ innings. That's your 4 guys you're counting on at the end of games and 1 random guy. The expectation is that Romero will come up and be a 5th end of game guy. What else do you realistically want from a bullpen? This article and thread have people acting like the season is over because some random dude the team was never counting on came in and was absolutely brutal in 1 game. But in reality the bullpen is doing it's job. It's not doing the extra stuff the starters are forcing it to try to do.