Lesnar In The Royal Rumble Match

What are your thoughts on Brock Lesnar entering the Royal Rumble match despite being WWE Champion?  Smart considering any contender they put him with in a match for the championship is a foregone conclusion, and/or also because it adds some mystery as to who will win the Rumble, stupid because it's yet another show where he doesn't defend the WWE Championship, or something in the middle?

I really don't think there's any particular mystery as to who's winning the Rumble this year.  As for Brock, he can get thrown out by (someone), they have a WM match, fine, whatever.  It's at least a semblance of a storyline for him.