I know that people often cite Yoeli's size as being too small. Perhaps at the 5 position, but I think that players like Draymond Green and Charles Barkley have showed that strength, athleticism, and good technique/position can make you successful even if you are a bit undersized. Especially at the college level, and with his leaping ability I am not worried about his size at all. Mainly just understanding defensive technique and positioning, which I am confident will come.
I've also been very pleasantly surprised by Beo; on the other hand I personally think Leifson's Blue/White game performance was a bit of a fluke. He doesn't seem quick enough to actually get meaningful bench minutes to me or to play any real defense.