There was no need to "construct" a major league roster full of "vets" that's worthy of "contention". AA was suppose to construct a system and an environment that would produce many young players. As we've seen in Oakland, Tampa Bay, Minnesota, and even Baltimore this can work.
AA was suppose to build a pipeline that could provide young players, and then compliment it with younger journeyman types.
Most Prospects fail. So you need to collect a lot of them. AA was suppose to collect as many as possible and create an environment for them to suceed. He gave up on this and created a scary, depressing, old, perverse team.
He was never suppose to construct a roster. He was suppose to construct a pipeline and environment which would breed success and let it evolve. At this he has failed.
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