Board Thread:General Discussion/@comment-12425721-20130716195655/@comment-11051098-20130808203427

He went on for who knows how many years as Arrancar 12 and then 6th Espada. I find it unlikely that he should have suddenly progressed alot in only 18 months.

And frankly, "need it to keep up with Ichigo" is 1 thing, but actually getting it is another thing.