The hardest way to figure out all this is have access to the playbook, and be able to talk to the OC, and figure out the concepts he runs in his passing game, and what the TEs purpose is within that concept. Is he window dressing used to open up another route run by someone else. OR he is the one of the main guys in that concept, while other players are running the "window Dressing" routes.
Once you factor in all that for each of the 32 systems, then watch film and figure out who is following that system to the best of their ability. Then the last step is look at the stats, and talk to the OC to see if those stats are par for his expectations in that system.
It's actually a pain in the butt process, but that's the way to analyse these positions.