The only way Ziggles in cashing in on Punk is if Punk and Sheamus switch titles.
Ziggler is the World Championship MITB winner (this happens every year with people not listening or understanding) therefore it can not be used on the WWE champion.
Apparently during the weekend house shows Ryback attempted to Shell Shock Paul Heyman, but couldn't get him up. So with Ryback struggling to hit his power move Shellshock do you think his push to the top will last that much longer?
Take it with a grain of salt.
Some reports say he did. Others say he didn't.
Simple solution: IF he's struggling to hit his power finisher, then all he needs to do is add another move to double up as a finisher.
Remember Batista? He's used the batista bomb, spear and spinebuster as finishers in the past. Undertaker has the chokeslam, Last Ride and Tombstone.
Chances are we'll see Ryback adding another finisher to his moveset. Just because he can't hit one particular move on a very small amount of people doesn't mean it's the end of his push.