Well, a couple things: height is just window dressing. If the 6'1" PF can rebound, he might be a serviceable big. Second, you can get better players in 3.0, so "raiding" D1 is a pretty good idea. If you look hard enough, you can find recruits who fall through the cracks.
Most bigs aren't great passers. When I recruits PFs and Cs, I look primarily for ATH, DEF, and REB. If you can get someone who also has decent speed, great, but it's not as important, at least to me, as those other three attributes. You can also settle for lower LP, provided it's green; LP and PER have the highest potential for HUGE growth, and it's easier to get a defender and make him a scorer than the other way around.
I have two pretty good bigs on my D1 Navy team right now. Each has ATH in the 70s, DEF above 80, and REB above 70. They draw a ton of fouls because of their ATH advantage.