Jaren Jackson is a five-star power forward. Yes he can hit some threes, but he's basically what you are asking for. That being said, it continues to sound like Maryland is in a good spot there.
Kyle Young has basically been offered by the majority of the Big Ten and I would be shocked if other schools aren't slotting him at the four. He can score with his back to the basket in the paint and can step out and hit a pick-and-pop three. That's basically what you need from a four-man in the current game.
Livers is a 6-8 forward who rebounds very well and can hit shots. What's the knock there?
I'm all for improving the five, but let's at least give Teske/Davis a chance to play. The numbers really dictate that it is hard to take a five in this class given the need at the four and the three.
Michigan has struggled to find good options at the four under Beilein -- I don't think anyone would doubt that. Glenn Robinson III was the best option and they haven't replaced him since. Finding an athlete and finisher at the spot would certainly help as would maybe a taller more physical player (something like Kyle Young, for example).