That's a good question. But to get there you have to decide how many true franchise QBs there are. I mean how many guys would you say "here is a player you could take and build a team around and him being on the field will get you X amount of extra wins"?
Obviously Mahomes, Allen, Jackson and Burrow. Then some of the younger guys possibly who still aren't fully proven like Bo and Daniels. But there are plenty of guys with franchise QB contracts I don't consider true franchise QBs. A few older vets like Stafford.
Dak to me is the one that comes to mind. Plenty of people love him, and when he's on he's great but so often I see him and think he's pretty pedestrian. Goff has been great the last few years but is he really a franchise QB? I love Baker and defended him a lot here when people were writing him off but again, not sure he's true franchise QB material.
Lawrence is in no way shape or form a franchise QB, other than his contract. Tua actually proved something when you see how bad that offense is without him. He's a system QB who runs that system perfectly in the right conditions but we all know what happens in bad weather and when he has to improvise. He's like a comedian who is great when he's sticking to a script someone else has written but goes to pieces when he has to ad lib.