Punk just too old and this is not his main discipline as much as he has trained for it.
If we look at Kobe's final season in the NBA, he was still great but clearly lost more than a step. Now imagine Kobe going to compete in say tennis at a high level against a 22 year old young buck who lives and breathes the sport. Just not gonna win. I make this comparison cause Punk is around that same age. But lets be real, Punk was never that athletic like a bball God of Kobe's caliber. His elbow drop was always no lift. Just not seeing an unathletic man past his physical prime beating a young buck in his main sport of choice.
What I loved though was Gall's peeps showing how to land a sharpshooter in an MMA fight....now if he can finish Punk with some shyt like that I would pop something serious