Ervin is not close to as polished as Frazier was at the same stage, but Ervin obviously has more athleticism. It would not be a surprise if it took Ervin at least as long as it took Frazier to get to the show, but that is putting the cart before the horse at this stage of his development.
Ervin was at least a year younger than Frazier was when he was at Dayton. I believe Ervin was 20 last summer when drafted. Frazier was in his 2nd summer of pro ball when he was at Dayton.
My sense is that Ervin is ahead, developmentally, but time will tell. It probably hurt Frazier that he was moved around so much.