Do you think a top martial artist could beat a top MMA fighter?
The argument always comes down to if Bruce Lee got the first shot in it would kill Tyson instantly, which is the common point for martial artists vs MMA... so who is the way a Western style fighter couldn't kill a martial artist in a single shot? I don't find this point very probably as all fighers are trained to avoid deadly blows.
Read about a Japanese Judu champion (he held the title of world champion before Judo was an international sensation) who lost to a European unranked novice because he was just overpowered by the larger body.
Not familiar with boxing history, huh? It may not always be instant death, but the trauma will lead to death if not treated.