I think it depends on what you are trying to do. I think in the lower divisions it's a solid idea to have 3 main trainees and 3 other secondary guys. No matter what those 3 main guys get 48+ then if you do it right your secondary guys will have the same weaknesses as your primary guys (or what you are training your mains in) Then they also get decent so say you have a 3 guys but you buy the secondary guys who are weak in the 6 position attributes. Like for me, I have 3 guys who I got that sucked at driving so my secondary guys also sucked at driving, now they are all getting better at the same time. Some of those secondary guys had pretty good attributes to start so I will be able to sell them for some good money when I want to move onto something else. But if I'm going to train passing I'm definitely only going to be training my main guys.