Biggest issue with knox imo, is hes not a TE
Yes he blocks, runs routes, and can make difficult catches. But in his career, hes only been able to get yds on the outside or in the slot. When in line, he never gets open. He doesnt find soft spots, or has a good instinct of how to get open quickly
He is technically a TE, but hes not capable of running routes in the typical TE way and hes not a target in the redzone. This has been his whole career, so i cant blame Dorsey. But once again, it's amplified by not having a Beasely type who can control the middle zone of the defense and get Lbs to keep shallow and allowing knox to get behind them