Re: Yes! Any Shinobi can use any technique unless its a Kekkei Genkai!
Itachi didn't break the edo tensei with hand seals/signs, Madara did. Itachi did it with Shisui's eye layering a genjutsu over the edo tensei which apparently gave him his own free will.
Originally Posted by hunk143
I don't know whether all shinobi can use all chakra natures. It would be contradictory to past statements in the manga, as no one can use all changes in chakra nature except for those who possess the rinnegan. Other than that, there's shinobi who can use 2-3, but that's about it. Special shinobi with kekkei genkai can use 2 at once to create another element or 3 at once for dust release.
There's an entire army of shinobi on that battlefield right now. Considering Kakashi has stated that most shinobi can use 2 different elements by time they are jonin, and many of the shinobi there are jonin, there are probably quite a few who can use earth element. Not only that, but there's probably others who can use earth but just don't know or haven't learned how to use it effectively yet.
To sum it up there's shinobi there who posses the ability to do earth element techniques but aren't skilled in it. That's why Shikamaru suggested an easy jutsu that anyone can do.
I don't think one statement from Shikamaru in this chapter completely trumps all of the past things we've learned in the older chapters. Re-read chapters 315-316 where Naruto learns how to use Wind nature.
Only the SO6P and rinnegan users can use all 5 elements, otherwise you would see more shinobi who could use more than 2-3. There are exceptions of course, like Kakazu who was able to use many elements thanks to having the hearts of others in his body.
Maybe, just maybe they can all use 5 elements, but if one doesnt have a natural affinity for the particular element they just can't do much with it, outside of very weak jutsu that would be useless in battle.