What I like about Horne are a few things.
1) He has a big body. Mold that thing up with some weight lifting and he could be very physical down low, even if he is "undersized"
2) He is crafty with his moves. Doesn't "wow" you with athleticism, but kind of reminds me of a Shavon Shields type player
3) Creative around the rim, with soft touch. Uses his body well to establish position on the block for a guy his size.
I also think this guy has room to grow. I wouldn't be shocked if he ends up 6'9 or so. And with that "beefy" body, hitting the UNL strenghth program, he could really bulk up well.