Board Thread:Theories and Rumors/@comment-35245651-20180830055900/@comment-30499831-20180830130009

Wu also mentioned the effect of the Time Blades was accelerating. Also it's doubtful they'd have Wu so soon

Krux using the Reversal Blade wouldn't explain why they were already young before Kai and Nya got the Blade. There's no point that would have happened because there's breaks between Kai and Nya getting it and the Time Twins betraying them.