Grady is not a PG.  He is more of a scorer.  Granted, at this time, they don't know if Mintz is returning.  The article that I read still suggested that UK has some questions at PG even with a true freshman and Askew returning.  The two UK commits at forward are 6'9", 205, and 6'6", 210.  I wouldn't say that is the same as Tshiebwe at 6'9", 260. 
I think bto's suggestion that you aren't going to find a high level transfer at PG with Chandler coming is correct.  Now, you should be able to find a 2 or combo guard who might play a little point when Chandler sits.