Learning a new position by playing at it

[USARABAT]

I cannot risk that but a tanking team with anything to loose, can build easily a team with 3 positions.

They won't be able to if the required matches to teach SA or new position is no less than 200-250 matches (4-5-6 seasons depending on success), If tankers decide to teach SA/ new position, they will be losing the opportunity to reach 120-140-160% as their players will grow older...