It was Cesaro, I thought it was no coincidence that suddenly got a big push when Punk left, maybe to try and keep the Punk fans happy. Since he's got with Heyman he's started to bore me though, hopefully there's a good payoff to it rather than him ending up with Rybaxel. Turning towards Ambrose now.
I'd imagine for Punk fans the go to guys would be: Bryan, Cesaro, Rollins, and Ambrose. On the rare occasion maybe Reigns or Ziggler.
It's a little predictable, but these guys were the 'second best' of most Punk fans. Like, no former Punk marks are gonna be like "Hell yeah, Del Rio!" or something like that. All the guys people are saying either have something in common with Punk, fill the indy requirement, and/or follow some type of 'cool guy' archetype.