Board Thread:Speculation House/@comment-27883360-20160305074527/@comment-82.13.219.77-20161106191857

Its also possible that like Jaune, he doesn't have one, or rather perhaps its damaged or 'broken' in some way from some past experience such as over-exertion or trauma. There is after all a lot we don't know about Ren.

Unlike Jaune, Ren is actually a very skilled figher who is fully capable of using aura to its greatest potential in a fight (As seen with the King Taijitu), so he got into beacon academy purely on merit of that rather than any special ability. We all knew Nora was a powerful fighter before any of us knew what her semblance was much in the same way, so there might be a very definitive reason as to why we haven't seen it yet rather than it just not being convenient.