I get your point, but the comparison really isn't valid between Lee getting knocked out three years ago and the fighter we've seen out of Nate in his last three really isn't comparable. We've seen Lee improve as a fighter over that span in his striking and his ground game. Nate, we've seen him beat a highly capable, but inconsistent, M. Johnson and fight Conor, who is nearly the tailor made opponent for a Diaz bro.
We've seen improvement from Ferguson as well, though not as drastic, and I've never questioned if Tony took a fight just for a payday, the exact opposite can be said of Nate and his last four fights.