User blog comment:SilverRain/Ichigo's True Strength/@comment-10961564-20130630094632

I don't think that his powers would be greater than that which he attained after Dangai Training becoz even Aizen Sōsuke(merged with Hogyōku)was defeated by him EFFORTLESSLY. More power would mean that nobody can even stand against him......

However we have't yet seen Yhwach's full power so ichigo might have more power than the Dangai ichigo. If that happens, then he should have a completely different appearance as he has a new Shikai(now a pair) so a new Bankai is must.