For what it's worth - I have a friend who lives near Onalaska. He's a certified official, and is fairly well-connected to the local hoops scene. He said that Thomas is a "nice" player, but at this point, he sees him becoming more of a complimentary player at the D1 level - as opposed to a "difference-maker." (This friend is the same person who saw Ralph Sampson III play at an AAU tournament as a HS junior, and told me (quoting) "He's too soft. Doesn't want to post up inside and use his height.")
Apparently, (from what my friend says) Thomas' coach has a habit of 'featuring' his star players - as in, let the star player take most of the shots and pad his stats. Also, the caliber of ball being played in that part of Wisconsin does not compare to the talent he'd face in a bigger metro area, so I remain skeptical until I see him go up against some top-flight competition. In most of Thomas' games, he's facing smaller guards, or big men who aren't quick enough to match up with him.
I'm not saying Thomas can't turn out to be a decent player, but I wouldn't throw myself off a bridge if he doesn't go to the U.
