Board Thread:Naruto Discussions/@comment-34938099-20180807075632/@comment-2043993-20180807082154

I think the whole point with the Six paths of pain tech (and six paths) is that each path has a specific set of skills and could not use any other abilities. The same question could be asked about Obito's usage of the tech and why none of the jinchuriki used wood release or Kamui.

The answer is the same: They couldn't use it, because the technique didn't allow for such.

Besides using the tricks and taijutsu that Jiraiya taught Nagato, against Jiraiya himself, wouldn't have been a prudent tactic, as he'd be familiar with them and thus would be able to come up with a swift and devastating countermove. To use what Jiraiya taught him, Nagato would effectually have been digging his own grave.