I noticed the same thing. It's almost like he's trying to be Adam Booth. Not a good look. Booth reminds me of some boiler room salesman. Kugan on the other hand is the Youtube boxing dude, too funny.
It is natural to pick up mannerisms from the people you interact with. In my opinion he is quick witted and has a great sense of humor. Anyone can come up with quick one liners they thought up before an interview but he does it on the spot. Watch through any of his videos and you will see this. I don't believe he is a Haye clone. Haye has a bitter personality listen to him during Wvlads last fight slagging off the Italian. He made himself look like a dick in the run up to the Wvlad fight and showed little personality or humor other than his **** borat impressions.
Groves is naturally quite a dry lad, quite funny actually. He's way more entertaining than his mentor Mr Haye, who is the most boring **** I've ever had the misfortune of listening to. I'd find being diagnosed with AIDS more amusing than one of his ultra rehearsed interviews. The Dark One.... not fussed either way for him really. I think him and Kugan have a really odd mateship on the camera, and in general he's just a bit weird. Him vs Froch at a press conference would be gold. You'd have two of the best straight faced smurkers H2H.