They are rushing them through or bypassing AAA entirely but that doesn't mean they aren't conservative with the prospects. Perhaps if nearly all of the high school players weren't required to play short season ball until they were 20, go to Beloit for a minimum of 1 year and spend 2 seasons between Ft. Myers and New Britain, they would have more time to spend at Rochester. College players have it a little better. Most only have to play one season of rookie league.
The orgainzation thinks it is manipulating the youngsters' contract situation well, but it is backfiring. These guys are in the system so long, almost all of them are forced onto the 40-man roster when they are still only in AA, with some having to be assigned while still in Ft. Myers. This is not good planning. The Twins are forcing themselves to make roster decisions on guys who are still several years out.
There is an esoteric arguement against this approach as well. While it is only conjecture and in no way could it ever be proven, the long wait to the majors could be killing the drive of these guys. If you are a high school player drafted by the Twins, you can almost put it down in ink that you won't have a chance at seeing Target Field for six years. To an 18-year old, six years is an eternity, it is in fact 1/3 of the time they have spent on this planet. For plenty of young men, knowing you have next to no chance of reaching your dream for a half of a decade could really dampen the fire that got them drafted so high in the first place.
For the love of the game, move Sano from Beloit ASAP. Why must his defense and contact rate be refined in Low A ball? His main attribute is his power and that is easily passing expectations. He can improve his glove and batting eye at Ft. Myers just as easily. Ditto for Rosario, .410 OPB with 17 BB to 15 K's? What more does he have to prove other than two months isn't quite enough time to adjust to a new postion. Ft. Myers can help with the transition, they have better coaches anyway. At this rate they too will fall into the same trap. A full year in Beloit followed by a year split between Ft. Myers and New Britain. The next year they start at New Britain which is when whispers of a call up bypassing Rochester takes place.