Hunt was powerful but overweight - Gal is super fit as we know. It will be the younger fresh, fast and fit fighters that will really challenge Gal. Regardless Gal has played what is in front of him and never lost a fight, that deserves some respect, is putting in the effort and earning his pay days.
Tszyu is just an animal like his father, strong but technically proficient he's going to go very far in this sport
The first fight between the 2 aussie fighters has been dubbed the fight of the decade - need to look for a vid of it later
I don't know that Hunt was especially overweight, seems to be he was often about that weight during UFC career and then had to cut just before contest to get under 120. So he'd be used to training at that weight and avoiding the cutting would have been beneficial even if he is a bit heavier to lug around.
I think more than just a fitness issue he is just old now - he's a power fighter who is 46 now. Between that and never being an especially fit guy he was always going to struggle if it went past first few rounds.
Hunt was about the age Gal is now when he was fighting and TKOing the likes of Nelson, Struve and Kongo
Gal keeps getting stacked up against big guys, Hunt, Herman, Paulo - Barry was about same weight but much taller. Gallen relies on toughness and volume of work to win for the most part so I think you're right a fitter more technically sound boxer wouldn't let him get all those shots and would be looking for them themselves.
Boxing is a great pay day for Gal and while he keeps winning he can keep getting paid so he may as well go for it.