Board Thread:Questions and Answers/@comment-28648393-20160616142328/@comment-1970092-20160621212231

I don't think this is the final fight at all.

But it's been brought up that the Soul King may have given Ichigo a secret power, one that Ichigo isn't even aware he has. It would explain why the Soul King was interested in Ichigo (the Soul King can also see the future, so seeing Yhwach's invasion in advance, and given Ichigo's heritage, he might have thought that Ichigo would have been the perfect person for the job), and why Ichigo's training, and more importantly his interactions with the Soul King (assuming that they even happened at all) weren't shown.

But this is just 100% guessing as I've nothing to go off of~