I still don't get where people get this retirement shit from? I thought one of the last interviews Kane did, he denied reports of retiring, but said he was staying away from the title because he wasn't sure he fit into any of the storylines surrounding the title at the time. People stick with this rumor that Kane is retiring SOON, but this rumor spread within a year of him being unmasked. Hell, I remember Taker was ready to retire around the same time and still hasn't.
Anyways, Kane is an incredible talent, in the ring, and in promos. The guy has lived in The Undertaker's shadow his entire (kayfabe) career, and for him to manage to stick it out and keep going and not leave the company or complain and accept his "role" he's been given has been incredible.
As far as the storyline goes, I'd love to see Kane play away that it wasn't him for as long as possible, even when Taker returns, keep him guessing as well. Bring back the Brothers of Destruction, and use it as Kane's way of keeping Taker off his coattail, and away from the belt. And then eventually have Kane betray Taker and expose it all, leading up to a huge series of matches between the two (hopefully HIAC & Buried Alive since they've not faced off in those matches yet).