It’s a team game where the qb is the leader of the team responsible for most or all of its points. Allen’s overall stats may be similar to Mahomes thus far this season but their performances have not been the same. Allen accrued a lot of those stats in the blowout wins against the Fins and Raiders. He struggled against the Jets, Jax, NYG, and Pats losing 3 of those games. The Chiefs offense, while working in new receivers, have not struggled as much in their games as the Bills have and still managed to win 6 out of 7 games.
No one that has watched both teams so far this year will say Allen has been as good as Mahomes if they’re being objective.