In terms of training speed, is the below more or less correct?
(from fastest to slowest)

Auction -- for young ones, about 50% are super fast trainers
Scouts -- medium (depends on age too)
Academy -- generally slow trainers

Negotiations are not really in the list as its random, u either get a lemon or a gem. Seldom gems as most managers are willing to let go only duds and lemons.