I'm not trying to give you crap but it is nonsense to think this isn't Kelly's offense and that Rees is providing some new approach or insight. 2020 saw the same set of standard plays that have long been Kelly's staples. Rees simply doesn't have any significant exposure/experience to anything else to run anything different than the Kelly offense.
Rees may have a different rhythm to play calling but make no mistake about it, this is Kelly's offense. Kelly said frequently during the year that he wanted the team to be tougher, more physical. That isn't happening because Rees is whispering in his ear.
They ran more because they were playing with leads against less talented teams by and large. There was less passing because 1) this may have been the weakest group of receivers in the last few years and, again, 2) they were playing with leads.