Just to go back to the HW, I personally think it is just difficult to find big guys that are actually coordinated and talented enough to compete in the ufc.
Sure you can find the guys like Rashed and Jardine who can sit at the 220 mark, but there is that inevitability that they will just drop weight.
To ensure there not goin to do that ya need to find big
6'4" - 6'8" dudes who just cant physically loose the weight. Not sure about you but for the UFC to find 8-16 descent fighters that size would be difficult.