JS, DR and RB are the only skills that naturally are 2-positional for training purposes. For training regimes that are 1-positional, if you use the 2-position option the training will be around 2/3 of the full amount (so significantly slower). Since 5*2/3=10/9, you can get slightly more overall training, but in reality you'll be hooked up for longer and it's likely the players are not gonna be worth a lot on the transfer market because they will not compare favourably with other players of the same age.
okay okay think now i understand! So people start with 5 - 6 trainees to train the 2 position trainings, so they have 100% training on those, and then continue whith the players they want while selling the others. I could buy 5 players of the same position then & put them on the field for 100% training ? And continue after a season or 2 (or when i'm done for the 2 position training) with the 3 best ones? 
btw one more question: For example let's say i buy a trainee that says that he's center, but his stats are way more like a small forward (just saying a random position) and i train the stats of a small forward, will his best position change overtime? Or will it remain center? Does the position that is said he plays matter? or not? 
Thanks this is VERY helpfull btw! i didn't know that!! Super info this one! 
Last edited by Furyian at 7/25/2020 5:17:00 AM