Garland has some potential as a passer but his biggest issue, as a lead guard, is turnover generation. Passing isn't a super useful skill if it comes with an equal amount of turnovers.....and Garland has some concerning markers in his combined sample set of AAU, EYBL and his handful of college games.
His usefulness as a creator largely (to me), depends on how much he can improve his decision making. I think he's skilled and creative enough as a passer, he just tends to not make great decisions, especially in traffic.....and that is where he racks up turnovers. Hopefully Beilein can be helpful in that regard.