You're seriously going to 'correct' me on something like that? 34HRs in 2 seasons looks pretty damn good for a 19-20 year old. Keep in mind he'll get stronger with time. Most teenagers don't develop power until later on. Wouldn't be surprised if he became a 25-30HR guy in peak years. He's not a slugger, but the adjective I used could have been good, above average, whatever. I wasn't using scouting terminology. He can hit long balls just as good as anyone in our minors except for Sano and to me that's great. He's also a 5 tool player if he moves back to Center Field. The move to 2nd may be good organization wise, but it's a myth that it improves his prospect status. Sticking at second really doesn't take advantage of his arm. In a way I see him as a different version of Hicks. More power, more contact (minus) switch hitting, no down year (yet), less speed, and better at managing strikeouts. I'd give Hicks the advantage in the field (Hicks has a cannon, more experience, and speed+other things=range), but Eddie certainly could provide "above average" defense there.
Perfect example of reading too much into MiLB stats, especially rookie level ones. Rosario isn't going to launch 25-30 HR's at his peak (that IS a slugger). Maybe 20 at his peak, but where the "power" will show is racking up doubles. As for his arm, it's not a cannon, think a bit better than Span's arm (which is below average, but not close to Revere territory). He'll likely make more contact than Hicks (better avg.), but probably won't match the OBP.
I recommend checking this out: Scouting Report: Eddie Rosario (2B) | Baseball Prospect Nation
He doesn't have a slugger's body and there's not much room to add on strength. He's 6 foot 170 lbs-ish, and looks smaller than that in person to be quite honest:
Bat speed can do a lot for you, but without large® body mass behind it, it's not nearly as potent as you think, doing more for "hitter" attributes than "power" ones.
If I'm describing him, Span is a good comp, with less on-base skill and a bit more double power, but not outrageous HR power. I also don't think he'll be as good of a defender in CF (can handle it if need be), and he still needs a lot of work to stick at 2B.
As for comparing Arcia to Kubel (pre-injury). Kubel absolutely RAKED, and was thought of as one of the best pure hitters in the minors before he blew out the knee. I don't consider Arcia to be in that lofty of hitting territory quite yet. I like the "Kubel-light" name I've seen thrown around.
Scouting Report: Power: 30, Hitting: 50, Arm: 60, Defense: 40, Speed: 40. "Line drive swing and shows good contact and on-base abilities. Double's power at his peak. Strong arm from 2B or the OF, stiff hands. Not a fast runner, but above average instincts on the bases. Skinny body doesn't look the part, but can sneak up on you. ACL surgery sapped much of his athleticism." (Probably)