There is a very good possibility that uzumakinagato is correct about the plothole, along the timeline (who would have imagined that). It all depends on the amount of time between the 2nd and 3rd shinobi wars.
Nagato was shown "awakening" his rinnegan during the 2nd war. This past chapter takes place either in or shortly after the 3rd war.
As a stand alone chapter, pretty good (especially considering the crap that has taken place the last few weeks). But I can smell the shitholes already (Until the manga reaches a quality level, IMO there are no plotholes, but shitholes.)