Franchise player to me implies a guy who's career would be a disappointment if they didn't make the Finals at least once.

A star to me is a guy who should consistently be able to lead their team into the playoffs. Like Paul George is a star, if you put him on the Lakers right today, they could make the playoffs within 2 years or so.

If you put JJ Redick on the Lakers, they'd definitely be better, but no one would be surprised if they missed the playoffs cause people would be like "What'd you expect? Their leading scorer was JJ Redick!"