Matt,
Yes, I'm fairly sure he's on some type of designer steroid, and I'd assume HGH as well, given that he's healing from a fracture. I don't really know much about roids, other than from being around friends who did them and from reading forums, but I am around his size and boxed in a few weight divisions, so that's what I'm basing my opinion on.
I would say I have good genetics, and I used to really smash the weights hard. There's no way I'm getting up to 190 lbs and still being in any sort of condition to fight. Absolutely impossible without drugs, in my opinion. I went two weight divisions higher than my fighting weight in the amateurs before, but even with stuffing my face, I gave away a lot of weight and speed. I did it because I couldn't get fights easily and I knew I'd bang the other guy out if I connected.
What guys like Pacquiao and Canelo et al have done is, again, I would say impossible to do without drugs. A fit, in-shape fighter can't just climb up weight divisions like that, keep both speed AND power, and still stay lean. I think drugs are simply a huge, unspoken fact of most professional sports - especially combat sports.
Connor, from the little that I've read, is up to around 190 lbs but still pretty lean and able to compete at a high level. It's not that he looks like some musclebound juicer (although the traps and shoulders are suspicious); it's that he's climbed up to that weight quickly and maintained his athleticism. He will be chasing a big-money fight with Usman because he doubts Usman's ability to KO him and he thinks he has a chance of winning that title.
That's a bombshell right there [for me]. I always basically suspected that steroids are in all sports, and especially in fighting - but we just had a full major sports league [the NFL] pretend that concussions weren't a problem for basically the past 35+ years...so it stands to reason that many sports and sports leagues basically operate in denial...
A friend of mine told me that on the Sherdog MMA forum, you aren't even allowed to question if Georges St-Pierre used juice. Here's a guy who looked like a Men's Physique competitor in a hugely juiced division in a hugely juiced sport, way before the strict testing era started...but GSP was natural, apparently.
I think people think "But he's only 170", not grasping that he's fighting at closed to 185, and was lean enough to have all abs showing. I have an idea of what I would need to use to look like that - I don't think I'd need a ton of juice to hit that weight with that body composition...but I can't fathom hitting it naturally.
Regarding Kamaru Usman versus McGregor:
Usman has proven himself in the octagon at this point - some argue that he's the best welterweight of all time. I think his beating Colby Covington the first time was impressive - but Usman really sealed the deal beating him a second time, IMO.
I can't fathom anyone under too many guys under 205-lb can beat Usman?

I mean, his fellow Nigerian Israel Adesanya, yes. No doubt a good argument could be made for some other middleweights beating him - but McGregor?

I'd just have to think McGregor gives up too much size to win that fight - and arguably, McGregor's gas tank is not great.
I guess there's a small chance McGregor could beat Usman in the first round - but I don't see how McGregor could win it if that fight goes to round two.
I do hope McGregor wins his next fight though - he has brought a lot of fans to the UFC.
Just wondering, but what did you mean here, Phantom?:
I went two weight divisions higher than my fighting weight in the amateurs before, but even with stuffing my face, I gave away a lot of weight and speed. I did it because I couldn't get fights easily and I knew I'd bang the other guy out if I connected.
Do you mean - there were more fights open to you in a heavier weight class? And you still had the ability to score a knockout?
Did that strategy work for you?
I competed once in an open weight Strongman contest two levels below nationals [basically - one level below provincials].
I came last.

But it was cool to throw my hat into a competition that was out of my league.
Did competing under-weight work out for you?
And out of curiosity, if you made up for some of the weight with just fat, would that have helped at all? Because, funnily enough, I find that even adding some fat helps with strength. I have no idea about fighting - although I'm always intrigued seeing fighters with Dad Bods winning fights.