One of the biggest debated points I've seen recently is the discussion of what Nomura meant when he said this in regards to Xemnas and Keyblade wielding:
Well frankly here's the best explanation I could think of: Xemnas exchanged his ability to use the Keyblade for the ability to gather hearts destroyed by Keyblades.I'd rather that point remain a mystery. It's possible that he intentionally wasn't using one.
Sounds strange, yes, but that point was NEVER explained in the series or in an interview. I mean to me it's just odd that all the hearts captured from a Keyblade just magically gather right in front of the Castle that Never Was without some special skill being involved.
Recall how Master Xehanort transformed his Keyblade into a ball of energy used to summon Kingdom Hearts. Perhaps Xemnas has a similar ability, yet the difference is that since he lacks a heart, he can't regain his Keyblade.
Anyways, just a small idea I wanted to throw out there. Criticize and praise what you will.