Maymon has too many knee issues. If he absolutely dominates next year, he's a second rounder. Otherwise, he's not an NBA player.
Richardson I see as a DeAndre Liggins type, where he may not necessarily get drafted (Liggins was, but 53rd out of 60 picks) but he'll make a team and stick. There's always demand for perimeter defenders of his caliber.
Stokes has ability and will be drafted, but if he wants a guaranteed check he needs to take a big step forward in rounding out his game between now and November.
I'd feel better about McRae's chances if he were a year or two younger. If you want to get drafted as a senior, you better be dominating the college ranks.