Do you really think anyone is going to watch a 3 hour football game from the 70's just so they can make an argument on a messageboard? Dude, will you even take time to watch any video at all or Google anything? I seriously doubt the guy is watching full games and certainly not 20ish of them.
I grew up watching Tarkenton, Unitas, Starr, Jurgenson, Gabriel, etc. Saw all of them many many times. Trust me arm strenght was never an issue for Tarkenton. What was real obvious is that he could be a slot receiver, hahahaha~~~~~~