Board Thread:Wiki Discussions/@comment-3238846-20140422105553/@comment-17623-20140430163617

Do note that the Tailed Beast Ball they were trying to stop was huge and likely covering far more than what we could actually see in panel.

Do note that we basically only saw the end of that "Operation: Wall to Stop Spherical Death Time".

Do note that Shikamaru said something along the lines of "We had them do a basic earth jutsu that everyone could do." then some spiel about "slowing it down with many smaller walls because they don't have a large stronger one".

And seeing how a prerequisite (could be wrong on prerequisite) of becoming a Konoha Jonin at all is being able to use at least two nature transformations well, it is not beyond the realm of disbelief that yeah, everyone does have the natural ability to use every nature if they learn how, they just have an affinity with one which makes them a "natural" at learning it.