Ridiculous that is!
You can create 5 Bareas in time for one Westbrook, D. Williams or even Rose. Their personal match ups though would reveal some differences.
I don't think that there is a huge difference in training speed, certainly not a 500% difference (I know you were exaggerating... but still).
Taller guards also train inside skills at a quicker rate which can be a significant advantage if you're training guards with more than six skills.