What you are stating is no fact.
I've seen him release the ball quickly
enough when he needs to, and I will take Tom Martinez's(R.I.P.) word over any one else's when it comes to mechanics, who said he can fix Tebow in 2 weeks. He obviously didn't think that there's something seriously wrong with his throwing if he made that statement.
So what happened? Didn't use his quarter? I bet Martinez believed he could fix any QB's throwing motion/mechanics. That doesn't mean much. It's all about the QB's ability to embrace that change to the point it becomes second nature. Because unless they can they revert to form under pressure.
And I will take Johs McDaniel's word who saw enough potential to draft Tebow, has closely worked with the Gators before and currently has the Patriots once again as one of the best offenses in the history of the NFL ....over John Elway's any day of the week.
Josh McDaniels may or may not be an offensive genius. Apart from his performance with a GOAT he inherited...in an offense he inherited...who knows. He didn't fair nearly as well with Kyle Orton or Sam Bradford. And before you hold Matt Cassel up as his shining example, Charlie was able to pull off the same trick.
But I don't think you can fairly say Elway saw no potential, let alone list it as a fact. Not that I put so much weight on what he says anyway. Michael Jordan runs the Bobcats too.
Elway not only saw no potential, he ran screaming from lack of it because he knows what it takes at minimum to be an actual contender in this league at this time. Every GM wants to win every game. Elway visibly recoiled at Tebow's ability to pull a win out of his ass randomly. Because he understood the randomness of it. And the fleeting nature of random. Kind of like Rex and Jets fans didn't.
I think Elway simply saw the type of coaching staff he had in Fox and McCoy, the type of offenses they liked to run and believed in and he understood the type of quarterback Manning is. He's also a new GM and wants to be successful, and he made a no brainer decision. As a GM how much safer can it be than hiring Peyton Manning to be your quarterback.
Yeah, coming off multiple neck surgeries at 36 that was a no brainer...
Heck if Tom becomes a free agent tomorrow nobody's job is safe. Maybe not even Manning's. I actually question Elways intelligence if he wants rings, considering Manning's playoff record. Other than Farve I can't think of too many guys who missed the big game as often as Manning despite so many chances.
You probably also can't name too many QB's who consistently won as many regular season games or got to two Superbowls in 3 seasons, which is the kind of scenario Elway was brought in to Denver to recreate...after more than a decade of randomness in the Shannahan post Elway/Jake the Snake/Cutler/Orton/McDaniels eras.
PS: Using Rex doesn't bolster your argument. This is a coach who thinks Mark Sanchez gives him the best chance to win. He believes playing football with a guaranteed negative turnover margin gives a football team the best chance to win