If the Celtics unfortunately fall into the 7th pick or so, I guess the best of a disappointing situation would be to pick Noah Vonleh. Not to say I don't like him. Body-wise and some skill-wise, he reminds me of Taj Gibson who is a very good, versatile player.
At the same time, if it's possible for Ainge to drop down a bit, I wouldn't mind picking Clint Capela. He's as athletic as Wiggins is, which is saying something since he's 6'10 plus with very long arms. The thing I like most about him is simply his ability to finish around the rim. The supposed "raw" athletically gifted bigs who don't pan out seem to be the ones who can't finish a freaking layup. If Biyombo was a better finisher, he'd be a very good player. Capela doesn't appear to have that limitation. With his size, elite athleticism, finishing ability, rebounding and shotblocking, he has to have one of the highest ceilings in this draft.