I think Brees was about as small as you can be and still be able to play QB in the NFL. He looks quite a bit bigger than Young and wasn't allergic to the weight room. Brees was also one of the most motivated players ever.
Canales should of pounded the table for a better QB in the off season then. Morgan and Canales built this pile of sh*t so they are kinda stuck, but you cant put everything on Young if you keep sending him out there.