Those of you that keep bringing up Josh Allen's first two years, ignore how much he improved from Yr 1 to Yr 2. He was deemed a project his first year and had terrible numbers. He increased his TD% by +39%, rating by +26%, reduced his INT% by -53%, his Sack% by -5%. All of these stats: Y/A, AY/A, Y/G, NY/A, ANY/A increased. His winning % increased by +38% with a solid 10-6 record. He exploded in his 3rd year.
Mac has done the opposite from Yr 1 to Yr 2. He was deemed the most NFL QB ready rookie coming out of the draft and had above average numbers his rookie season, making the playoffs & even the Pro Bowl. So far, he's decreased his TD% by -48%, rating by -21%, increased his INT% by +104%, his Sack % by +31%. All of these stats: Y/A, AY/A, Y/G, NY/A, ANY/A have decreased. His winning % has decreased by -32% with a 2-3 record so far.
I know that we're only half way through the season and things can change but if you look at the Sophomore seasons to date of these two QBs, they are mirror images of each other. Allen improved a lot. Mac has regressed a lot. Hopefully he turns it around. The game on Sunday will go a long way to show that he gets it.
Ref: Pro Football Reference