Sorry no, I'm guessing that you don't actually know that many boxers or that many kickboxers.
Ray Sefo: kickboxing 56 Wins (38 (T)KO's, 18 Decisions), 21 Losses, 1 Draw
Boxing 5 Wins (4 (T)KO's, 1 Decision), 1 Loss, 0 Draw
MMA 2 wins, 2 losses.
None of those records actually show a 'legend'. The boxing record doesn't show him quite as you show either.
If you want a legend try John Wayne Parr. 99 Wins (45 KOs), 33 losses, 1 draw or Crocop when he was kickboxing, Peter Aerts, Ernesto Hoost etc etc.
Er no, we don't train in boxing gyms, there's a lot wrong with that statement! You don't know much about MMA then.
Ray Sefo is a KB legend. As is Andy Hug who had plenty of losses. The level of other kickboxers was very high.