Should Allen build on his elite early play to either succeed Jackson as the best QB in the 2018 class, or even better, succeed Mahomes as Super Bowl MVP, he could command the second-highest average annual salary at the league's highest-paid position.
At this point, with Allen turning the corner in his career, he shouldn't feel bad if his play in relation to Mahomes, Watson and Jackson gets him "only" into Russell Wilson's four-year neighborhood of $35 million per season, $70 million guaranteed at signing and $107 in total guarantees.
Based on the rising market values for young, successful first-round QBs as they exceed expectations on their initial bargain contracts, Allen was well behind but is catching up fast. His next deal will come with a high Wilson-like floor, but it can't be ruled out for him getting right under the Mahomes ceiling, depending on whether he can finish the season even stronger than he started it.