I did that in lvl 1, DONT TRAIN, BUY! the special abibillity. Ok let me tell you, will the player progress as a better defensive wall, the more points you give towards the special training, I don't know, please tell us what you see/feel is happening, as for whether he we be a better defensive wall once you finish, that is NOT for sure. He can still suck at his Special abilities, Special abilities player vary some a good at it some are bad, its just luck.