There was a brief period of time where Brad Johnson was pretty dang good, but I agree he's probably someone I consider a franchise QB. You make an excellent point.
I consider Brad Johnson more of a jorneyman starter than a franchise QB.
Vikings - 5 seasons: no starts in the first two, 23 starts over the next three years
Commanders- 2 seasons: 27 starts
Buccaneers - 4 seasons: 45 starts in first 3 seasons, 4 starts in the fourth year
Vikings - 2 seasons: 23 starts
Cowboys - 2 seasons: Backup QB, 3 starts in final year of career