Norton actually COULD, in theory, defeat Brock Lesnar.
Lesnar's major edge in the ring was the fact that he could over power his opponents, but against Norton, he's actually the weaker of the two. Norton would over power Brock just in terms of pure strength.
Of course, then, Lesnar would have the edge in athleticism. They are both pretty technically able. Norton is a more athletic version of the Paul Wight whom Brock defeated and drew with on Smackdown for a few months.
Magnum TA would get beaten pretty bad by Lesnar, because Brock covers ALL of Magnum's bases. And despite being booked as the big, strong tough guy, the biggest man Magnum beat that holds any memory for me is Arn Anderson.
I like both of these guys, mind you, but Norton should go over here. I just don't want to see a tie and a dual ouster, because either one of these guys against Lesnar is an interesting match to think about.
But Norton has a chance vs Lesnar, whereas Magnum does not, and anytime two American Wrestlers who are both former IWGP champs lock up is entertaining.