Don't be too sure. This could be poor translation or (cough, cough) revisionism.
1) For sure we have seen Guy use summoning.
2) The Databooks list him as a "3" when it comes to Ninjutsu and Genjutsu. Lee on the other hand is listed as "0.5", So there has to be a difference.
It's weird how Nagato seems to be the only one who used the rinnegan to that extent. I would say Nagato was said to have really strong chakra but Madara has Hashirama cells grafted into his body and he's the juubi jinchuuriki FFS. Madara has so many powerful jutsu at his disposal right now that using anything other than hungry ghost realm might seem trivial to him, he is an arrogant guy so why not?
With both Obito and Madara, there seems to be one significant difference. Nagato had access to both rinnegan eyes, while Obito only had one, and Madara currently has only one. When Madara was first summoned, he did utilize the powers of the rinnegan to an extent. There also must be a reason he wants the other one back. If he could do all of what he did before with just one, there wouldn't be much need for the second.
It's kind of like why Kakashi and Obito are limited to just Kumui. I think Madara needs his other eye back to utilize push and pull jutsu's, as well as Ninjutsu absorption among other rinnegan techniques. There is the matter of him using Susanoo with no eyes at all, but I think it's more related to the special chakra each Uchiha possesses that creates the sharingan and it's techniques anyway.
I think its safe to say Might Guy, Might Dai heh heh..no? Okay lol
The flashback says Gai was unable to use genjutsu/ninjutsu when he was 5 years old.
Please let Guy do some damage, something beyond healing, something that will put Madara down for a little bit, or at least show everyone that he is still a human and can feel fear. At least this much for such a great character who is about to die... Neji got shafted but let Guy have something :( cool chapter though. I doubt Kakashi has anything on the same level as the 8th gate, Guy would win in a fight hands down lol. But I would really like to know if Dai was able to take down all the 7 shinobi of the mist by himself, that would be such an awesome end for him
Guy won't defeat Madara.... his choice will be in vain, but might serve a greater purpose. As in buying time for Naruto and Sasuke... But I don't see how Sasuke is getting a power up... yes he has Senju cells now and chakra... but it took Madara YEARS to awaken the Rinnegan... I expect Sasuke eyes to be a little bit different maybe like the Elder Sons eyes as the next step towards the Rinnegan. Naruto on the other hand... how will the tailed beast improve his skills?
1) Sasuke has Hashirama's Chakra, freely given, (to jump start his cells), Madara didn't.
2) Tobirama is Guiding Kabuto's intervention.
3) Kabuto Ha more expertise about Hashirama's cells than Madara who simply inoculated himself.
You couldadd that Kabuto's Umbilical Snake might be doing more to Sasuke than just injecting him, it could also be restructuring him on the inside.
It's noteworthy that Both Naruto and Sasuke are recieving some very high level intervention to power their upgrades. This certainly not an Acheivement by hard work situation.
The way it's shaping up is that Sasuke provides the Eyes of the Sage, and Naruto provides the body of the sage plus the Minijubi. I'd like to see some Uzumaki traits played up by Naruto too.
Maybe he could get some Byakugan and put them in his eyes and get the rinnegan that way too hehe, or one and one. That would be pretty boss. They could shut down all his tenketsu and make madara a regular person again. Either way its gonne be a slow road to recovery for Naruto, he can't just jump back up from death like it was nothing, even Gaara had to take it slow for a little bit. Guy better buy some more time. You think Madara could get into the other dimension too?
I think Guy will do serious damage to Madara to the point he will begins to worry, but Guy will run out of time and dies.