Anyone gifted enough to be an NFL QB has the potential to be as good or better than Drew Brees. The question is will they put in the work and dedication that Drew put in - for as long as he did?
There really are QBs that are just that much better. For instance no one will probably ever duplicate Drews accuracy, Mahomes, Young and Favre were/are extremely physically gifted QBs.
If Qbs could just simply put in the work there would be more Bradys, Brees, Rogers and Mahomes playing now and in the past.