Agholor's avgs pre-2021: 76 tgt, 45 rec, 59.6% catch rate, 568 yds, 4 td
Agholor 2021 stats: 64 tgt, 37 rec, 57.8% catch rate, 473 yds, 3 td
I mean, not too far off his average numbers for his career. Not sure THAT player is worth what he is getting paid, but remember, there's only one football to go around, and the Pats are a run-heavy team (25th in the NFL in pass attempts, 8th in rush attempts), so there's going to be fewer passes to be caught than the vast majority of teams. Everyone is part of the larger whole. So you could have a WR that doesn't catch as many passes, but draws defenders away that opens up the field for teammates. In that sense, he's STILL contributing to the overall offensive success. Blocking as well - the Pats' WRs were great blockers this year, one reason (among several) why their running game was so good.
Given that the Pats signed Bourne, Agholor, Henry, and Jonnu, it's not reasonable to have expected them all to put up bigger numbers.