In terms of the FO, I don't think they've done enough to build up pass catchers around Allen, but then again, they seem to have a roster good enough to beat damn near everybody in the AFC not named Mahomes. And they've beaten him plenty of times in the regular season as well. Defensively they're strong in pass coverage and at pass rush, and they pretty consistently have a good Oline.
I don't think it's the world's best FO, but I don't think people can argue that the roster construction isn't good enough.