Your point being? Malak was one guy, not a thousand. He was also inferior to Revan. Yes Malak failed, but at least he accepted that. Kun just clung onto to life, refusing to admit he was a defeat.
Kun didn't say "I am nothing" and yield when thousands of Jedi were coming for him, why did Malak do it when he lost to Revan? A Sith should contain the hunger to kill and surpass his/her master. Malak didn't make it even with the Star Forge behind him, he even lost the will in the end. That's all pathetic for a Sith.