But in terms of this battle, Guts has never used any magic and while indeed a match for Zodd, both haven't shown the speed capabilities that the Naruto cast normally make use of, especially in the case of taijutsu specialists like Rock Lee and Might Guy.
I do have to respond to one point you made earlier:
The wave attack Kisame used on Team Gai was from a clone that was running on 30% of Kisame's chakra reserves, which makes it quite likely he would be capable of using the larger variation at his full power though he wouldn't be able to spam it since Samehada can't gain anything from Guts.
I was talking about the wave attack he used with team Guy. About the attack you are talking about, I think that extent was because he Samehada absorbed a lot of Bee's chakra, and a lot of the 8 tails chakra as well. Kisame himself said it, that he gets as strong as the opponent he is fighting, with Guts Samehada, doesn't have Chakra to absorb, therefore I don't think he can duplicate that kind of sphere.