You don't understand how impressive Lsu's killing more sith than the thought bomb is.
That's what, thousands of sith? Now, consider the typical win probabilities of really good vs. less good, say, olympic fencers or say other athletes. It's usually extreme to have a 90% win probability, that's like greater than the difference between the best and worst NFL team in a given year, where most models would put the win % in the 80s.
Now, let's say Lsu killed one thousand sith. What would her win % need to be to make this something as likely to happen as to not happen? 99.93%. That's a ludicrous win probability. It means that the difference between her and a regular sith lord is like the difference between the New England Patriots and a division II college football team.
OK, so what does this mean?
Well, consider how Yoda is not unimaginably above Dooku, and Dooku has struggled against pirates and nightsisters. Now, consider how Kopecz said that he would take a single sith lord over an entire division of soldiers. So the average sith of Kaan's brotherhood are already >>>>> dooku, and yet Lsu is unimaginably above them.
This is a spite against Yoda.