I trained two youngsters since I drafted them: 
(34005162) and 
(35668242). I planned to train both until they capped (possibly around 24~25 years old).
This season, I picked up another two youngsters: 
(38103565) and 
(38103542).
As I always used one-position training, who would you suggest to give up? 
Note: Oh my goodness, draft picks are coming soon after the playoff. Training headache ...