Where are you getting those TW measurables? I've never seen him listed below 237
NFL.com has Williams at 6'4", 252 (from Rolltide.com probably). Another measurement had him at 6'4" 237, which is probably more updated and possibly more accurate. So the range is 237-252, not 220-230. You really think the school has been consistently taking 15 pounds off TW's real weight?
Miller was listed at 6'3" 245, which I am assuming were his official numbers from the combine.
Anyway, that just goes to my point -- he has a lot to gain or lose at the combine where his real measurables will not be inflated.