Newton found a measure of success because he had all of Kyler's physical abilities, but was also 7 inches taller. I have no doubt if Kyler had a few more inches in height and a few more lb's in weight, he'd find a way to win more games - a la Newton.
That said, neither of them should be confused as desirable QB's... Neither of them are leaders of men. Neither of them were ever able to consistently win by lifting the team to the level play required to achieve victory.
It's interesting to me how Kyler consistently gets the benefit of the doubt as fans seem comfy tossing out every excuse they can grab hold of, as opposed to placing blame where it belongs.
On the flip-side, Newton rarely, if ever received this type of latitude from the fanbase, as he was constantly the center of attacks. Of course, his choice not to jump on the fumble in the Super Bowl was emblematic of his hideous leadership abilities... sorta like Kyler quiting on his team in his lone playoff game against the Rams.