User blog comment:Mich, Michele & Kuhla/Future Units Preview/@comment-26462351-20160118033110/@comment-5244332-20160121101848

current content is not just borderline completeble. Its like saying you can't clear maxwell without 7*s. Many of the content are supposed to be due 2-3 batches prior in terms of JP sequence. So yes even if you are using a all "Legend Stone" team with the right setup you can arguably clear 95% if not 100% of all content.

This means that you actually don't really need to RS into the best units of the game to succeed, but proper farming for spheres, imps, sometimes elgifs must be done.