The charge against Dave that he "mortgaged the future" is inaccurate and unjustified. The subjective ranking of the farm system as "last" when he left was probably also not justified since he left us with Bello, Duran, Rafaela, Houck, Casas and Crawford. That's not an empty farm.
Success follows Dave for a reason. Failure was experienced by Bloom, because he was a terrible GM.