We’ll just disagree - personnel and injuries play a large part in a QB’s success or failure (Cousins and his receivers, exhibit a). AJ started his pro career on IR. He had other injuries that limited his opportunities , and that is an obstacle the Tom Brady’s of the world would have a hard time overcoming (he of the eighth round in the draft).
I support my position with the words of Ken Zampese, who I’d venture a guess knows more about quarterbacking in the pros than anyone on here. The pieces just didn’t fall into place for AJ. They apparently have for Geno Smith, after all these years - at least for now.
And, for the record, I’m not sure I saw anyone stating AJ could have been a “franchise” quarterback (someone may have); I know I never said that. I only said he could have done better, under similar circumstances, as some current pro QB’s.