First I while I am guessing he will be a Tiger with new coach Hardaway, Tyler Harris is a take. Outside of that, if you look at our class balance next year we will have:
4 Freshman
3 Sophomores
2 Juniors (both bigs)
3 Seniors
You also have a possibility that you lose Wiggs next year to NBA. I think best option is a transfer that comes in with a redshirt year and would be a JR or SR in fall 19. Without that you have at most 5 upperclassmen by then and possibly 4 if Wiggs goes. A transfer with a redshirt ...like a 3 point specialist SG would be awesome for the future.
Other route is a JUCO who comes in as a jr and joins the Jacobson, Young class. In either case you probably are talking guard not big.
Cluck fass balance. Recruiting... you play to win the game! ( Best available always)