putting dents in Cena is best left to those who can actually bang on 'em with a hammer, not to a guy who's no better than a random guy with a youtube account.
as in, Punk slammed Cena harder than everything Rock's done in 10 minutes of promos across two segments. he can back it up and has a match. he can acknowledge Cena, the person, and doesn't try to mock him or his goofy aspects too much but cuts through that to the core problems - Cena the superman, Cena the "underdog", Cena the Champion, Cena the guy who needs to be knocked down a peg. as opposed to Cena, the guy who.... wears colorful shirts and has a fanbase with kids. Punk willingly acknowledges Cena as a character and as a person, but rails him in the spots where there's a problem or a contradiction within both. Rock just goes after the character in a position not much better than an internet troll. he can say what he wants, but if Austin's having a beer with Cena in the ring, there's nothing he can do to try to shatter the guy. let alone with everything he's put up with over the years with the crowds - what's a guy yelling at him gonna do? sorry, it's been years and that ain't working.
but Punk's different. his attacks cut through the merch, the sales, and go to the man. you're looking at the wrong guy if that's what you're after.
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The future must protect the clone's past.
"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.