Well Jae's PER in Cleveland this year, a team where he was asked to do more than stand in one place and launch open 3's, is 9.6. Semi's PER this year is 8.7. So he's already almost there!
On a serious note, Crowder put up solid #'s despite being a very limited player. Semi will likely never put up peak Crowder #'s for this team at least, but he might end up being more skilled.