@RobZilla:
Pekoms isn't exactly one of the elite of BM's crew. Him and Tamago both shook in fear at her anger when they were all the way away at Fishman island. Bobbin and such stood there without a care in the world. They aren't the ones being sent to destroy countries, they're being sent to pick up candy, that doesn't suggest elite warrior of the yonko to me.
Pekoms/Tamago might not be elite in her crew but they're the ones being sent to pick up what Big Mama loves the most, so that should tell you that they're strong. They had just failed in collecting the candies that she loves the most while Bobbin didn't fail his mission on burning down the country (Which I'm pretty sure, he didn't do it alone), so he doesn't have to be afraid of her, so to you being sent to burn a country means that you're an elite fighter but being sent to pick up what she LOVES the most is not?
Haki is much more common in the new world than in paradise, it's not special anymore. All we've seen from Pekoms is hitting an overconfident Logia who wasn't expecting to be hit. There's nothing to suggest his haki usage is anything more than amateur.
He's a yonkou member with a 300M+ bounty being sent to pick up Candies and one shotted Caribou in which he showed that he's an Armament user, a fast fighter and have an amazing defense.
We don't know how Pekoms came by his 300m bounty either. Bounties aren't a measure of strength, they're a measure of danger. Pekoms might have gotten that bounty for doing something outrageous, that wasn't related to fighting skill. Hell he might have gotten a lot of that bounty from just being on a yonko's crew. Ace's bounty was nearly double Pekoms' and he was nowhere near as strong as the top officers like Marco or Jozu.
They won't give him a 300m+ bounty just because he's part of a yonkou crew and we don't even know for how long he has been part of Big Mama's crew to begging with.
There's nothing suggesting that Ace wasn't near to Marco or Jozu, so that's just assumption on your part
Chopper on the other hand just went through 2 years of training and has only ever rained absolute destruction using his MP. There's a reason Oda put a 3 minute time limit on it, because it's bloody powerful that's why. We have no idea just what kind of effect Chopper can put that power to now that he can keep his mind while using it, since all we've seen of it was effortlessly one-shotting a member of the new fishman pirates.
He rained destruction on weaklings, MP is just another giant, as soon as Chopper transform into MP he has just become a target, MP is a last resource thing.
Chopper putting up an equal showing with Pekoms while in his over the top powerful mode, when Pekoms would have no idea what was happening is far, far more realistic than Zoro being on the level of one of the marines' greatest fighters.
Pekoms will just destroy him and he won't even be of any help If they need to make a last minute retreat also Pekoms is a new world fighter and a yonkou member, I'm pretty sure he have seen bigger and scarier things during his pirate life.