Yes you still need your hands up in UFC but there is more opportunity and incentive to close the gap which would suit his strength more and leave him less exposed. There are big hitters in UFC but as you know there are lots of different fighting types in UFC and some are not explosive hitters.
In K1 the obvious tactic would be to lure him in to dropping his hand and then trying for the big shot. At heavy weight nearly all K1 fighters are knockout merchants as there is no ground fighting allowed.
Royce might not fight him but it’s not beyond one of the Gracie’s. They are known to like to try their technique against vastly heaver and stronger opponents. This is the type of fight the Japanese like to put on just to see the match of styles.
It would be good to see him against a top ground fighter or craft standup guy. After all no one is going to compete on grounds of strength alone.
There are some top fighters out there who will exploit his weakness. Tactics will greatly depend on the rules of the completion and the country he fights in.
However, he is a monster and will be more than a handful for anyone.
I agree with much of what you said Wongo and I think there are many Ju Jitsu practitioners other than the legendary Gracies who could hand out similar lessons to Pudzianowski ... they'd be queuing up for a fight like that as you know ... after all, it would be a big money fight and that's why they do it.
As for that video example of that guy getting kicked when he dropped his guard?
He committed a most basic of all fighting mistakes in dropping the other hand when punching.
A lot of guys when they start boxing drop their left hand when punching with their right hand [orthodox]; some of them never seem to get out the habit for some reason ... a lot of them, just get knocked out though