Actually the Big Show has been eliminated by just one guy in every Rumble he has been in. Even R Truth this past year was able to take him out by himself. Even though Show has made the final 2 twice in Rumble matches he has never lasted long. In fact there is only one time that the Big Show has entered the Rumble not in the 20's as far as entrance order goes.
Really? I could've sworn I've seen him getting eliminated or tried to be eliminated by the majority of a roster.
But nonetheless it doesn't make him any less of a dominating force in the ring, and one of the odds on favorite.
Besides it's not about being able to last long to be a better Royal Rumbler, I just think due to him being a force to be reckoned with and the ease (if booked like that) he has to eliminate someone, just like Kane (but obviously being bigger, harder to eliminate by that definition) it makes him one of the better Royal Rumble participants to never win it.
And to top it off, I left it as a "personal preference" rather than actual fact, if it's an actual fact of to who really is the best to never win it, Kane is one of the top contenders, and Big Show is nowhere near.