He is light years better than any power forward we currently have (unless you count Ayton as a power forward), and he gives us exactly what we need at the 4 next to Ayton - Athleticism, rim protection, defense and at least okay rebounding, with enough outside shooting ability to keep opposing defenses honest.
Is he a star? No. But I don't think realistically we can do better at power forward.
Now, if you count Ayton as a power forward, we should also be inquiring about Drummond, who would bring exactly what we need at the 5 (athleticism, rim protection, defense, rebounding and toughness).