Looks fair. I'm assuming he's seen Gibson since his Tommy John. I think everyone is too low on Rosario and too high on Arcia. Rosario will ascend the system very quickly next season if he's not limited by injury. I feel it's possible that he could reach New Britain by late summer, but the Twins may hold him back because of the likely Ft. Myers playoffs. He rarely strikes out (which seems to hold most talented batters back), has outstanding contact, great power, and is pretty young at that. Remember too that he was the #2/#3 prospect in the system prior to the 2012.
How can people be too high on Arcia when he barely cracks the top 100 on many lists? Look at this guy's numbers:
18yo - Gulf Rookie Ball - .792 OPS, 187 PAs
19yo - Appy Rookie Ball - 1.096 OPS, 283 PAs
20yo - A Ball, A+ Ball - .866 OPS, 316 PAs
21yo - A+ Ball, AA Ball - .928 OPS, 534 PAs
The guy has been outstanding two years out of four and good the other two years. He's also been a youngster at every level. He'll be in AAA as a 22 year old by mid-season (at the latest). What more do you want out of the guy? The only real weakness in his game is the strikeout rate. Everything else is solid.
Also, Rosario is just one year younger than Arcia but is two levels behind him in the minors. Yes, the injury hurt Rosario but that's still a significant gap between the players.