You'd have a great point here if guys like James Harrison or Kurt Warner never existed. They both bounced around for several years on several teams even being out of the NFL. Then they got a chance later in their careers than most and in Warner's case had a hall of fame career while Harrison is a borderline hall of fame.
No doubt Dobbs path would be unlikely if he does become a star. But it's not unprecedented.
You're pretty infamous for attempting to use huge outliers as substantive support for prognostications that aren't panning out for you. Saying "there's a chance" isn't a particularly persuasive argument. Sells lots of lottery tickets though.
Never said what "can't" happen but can point out Warner was a star by his 2nd season on an NFL roster and Harrison in the Pro Bowl in his 5th.