I hope to see what he looks like with a true center in the game with him soon. He is class and his wife is a great twitter star, too.
The way I see it, Horford should be our center. Don't think he is quick enough to guard stretch fours out on the perimeter any more. We have to pair him with an athletic PF who can space the floor, grab some rebounds and protect the rim.
I think a mobile, but, rebounding PF is what we need to put next to Horford. If he can shoot great, but we need a specialized PF who can make up for Horfords weaknesses on the glass and on the perimeter on the defensive end.
So in essence I agree with you. However at this stage of his career I think Horford is better suited to be the rim protector. So if we had someone capable of guarding those quick pfs, we would be golden.