Did you expect him to come back and one-shot one of Pein's bodies? Did you expect him to be carrying a scroll and the cape like the fourth? I'm not saying he did it, I'm saying it's possible. You have no idea what the sage techniques (jutsu) are. Absence of proof is not proof of absence.
Nice last sentence

, but your last tread didn't help u...
Like u said I didn't expect him to be that strong, meaning that giving more power to naruto would make the manga lose his credibility...
Naruto ws just given a really big boost with sage mode ( u've said it he killed one pein in one move) and now u want him to have learn an other element??
Why don't u just give him godly power right away and make him fight madara and pein at the same time??
You should know by now that kishi never rush things! It was a big surprise for all of us to see the change that occurs in naruto's power and attitude, but wanting him to learn an other element while he was in Myobokuzan would be a waste!
Do you remember how much manga it took him to master wind? Kishi will surly take has much manga for him to master an other element! He wouldn't have done this in the shadow and bring this up like:
Naruto *use fire jutsu*: ho yeah by the way I've learn fire jutsu plus everything else...
Your dreaming dude, this would be a failure if kishi done this!
Naruto being wind natured should learn fire because if he uses wind and fire together then it will be even more powerful. As explained by Yamato
I said that in the last page of this tread!