Great points!
Other than Cook (this year anyway), I would say Allen's weapons are in the same "mediocre but Josh makes them better" category that Brady had for most of NE years, especially the WRs.
The bar for a HOF type season for Cook was set by Barkley (and even Taylor) last season. He would have to average 122 YPG rushing for the rest of the season to get into that stratum. Same for Kincaid--he's off to a better start than last season, but still only 5 targets a game, so the opportunity for a massive impact (even for a TE) is limited. The Bills spread it around far more than, say, KC with Kelce who has averaged 8 targets a game over his entire career.