The question is: how usefull is it to 'waste' one week for your primary trainees to e.g. let a big man eventually pop from awful to inept.
Your bigs are quite taller than 6'7'' and not 18or19 years old. they will train really slow if you will train OD for 2 positions. (and i'd never ever recomend this)
In my opinion this will not lead to a better performance or financial benefit when selling them. Keep focused on the guards.
My 2 Cents.
Ted
Manchmal ist man der Hund - manchmal der Baum.