I think when people say "stop bumping so well", that's usually because guys that can't talk and don't really stand out, but can sell like crazy, are typically given jobber roles. That's what happened with Ziggler, that's why he's in the role he's in. He's gotta try to get over based on other things.
The guy has gotten mic time, they just aren't going to *always* give it to him and hope he eventually gets good at it. He had lots of mic time in the Cena feud and when he had the Survivor Series team in particular, plus they let him cut promo's on that main event show or whatever it's called. Lately all he does is break kayfabe whenever he speaks... why would they let him do that on one of the main shows?
As for him having everything Bryan's got, I don't really think so lol. Bryan's got way more interesting submissions, can do some high flying moves, Bryan's got a catch phrase, Bryan in my opinion has way more charisma...
I understand why people mention that he should stop selling the way he does, cos he makes an opponent look incredible and becomes and incredibly valuable commodity that doesn't need to be pushed. But if he stopped bumping right now? he'd be taken off the show completely. That's the only thing keeping him relevant at this point.
It's one thing to give him mic time, but in that department, he's essentially chastised. Only people he's worked the mic against are people like Punk and Cena, who make him look like a rookie. Dolph has this aura and charisma about him, the obvious reference to this is his sense of humour, he's extremely quick witted and clearly confident in this role, yet the only time I've ever seen him allowed to express this side of him that could EASILY get him over huge, was on NxT season 2. which about 34 people watched.
As for whether or not he's got all the skills Bryan does? he does. Bryans way more skilled in the ring, don't misunderstand me. But Bryans also probably the best in the world in the ring. The fact that Dolph has kept up with him on every occasion speaks volumes about his talent, but I can concede, Bryan is better. Dolphs got a catch phrase too, just doesn't have 15k people screaming it on RAW each week, Bryan was right place and right time and he took off in a huge way with that catchphrase, but it honestly could've been anyone.
At this point, i'll give you that Bryan has better mic skills. I'll agree to disagree on charisma, but you could be right in all honesty, Zigglers never been given the chance to really shine with the bright lights on and the volume turned up to 11; for all I know, Bryan could just be better even then.