If it is true that we are signing Kornet, then we already have 5 bigs:
Horford
Williams
Williams
Gallinari
Kornet
We may sign a 6th but I suspect the priority now is another wing. I agree that a long athletic defensive minded center type would be useful as none of Grant, Gallinari, or Kornet are that but right now we have 5 combo guards:
Smart
Brogdon
White
Pritchard
Davison
Likely to be on the team but only 4 wings (and one of them potentially a 2-way):
Tatum
Brown
Hauser
Thomas
We may not fill the 5th Combo guard slot but we need to add a wing. Maybe they add 1 more big instead of the 5th combo guard, it makes some sense. We need that established vet wing for the bench though, more than we need a 6th big.