I was just being snide lol ... don't take it seriously ^_^
Oh
lol sorry, I know I take MK too serious sometimes lol.
There are no facts in MK storyline to make you reasonably assume that Sub-zero and Scorpion can beat Kitana. The only clear fact is that Liu Kang is better fighter than everyone else. But sure its unlikely that she could beat them both but who cares its a fan video it was just made that way for the lady to win.
Well...Actually, if you want to technically break it down Sub and Scorp have better feats as far as the canon MK saga. Kitana has no valid feats that put her on par with Sub-Zero(either one) or Scorpion. What has she done? Defeated Mileena(not a huge feat), chocked Shang Tsung with him not even fighting back and getting trolled by Liu Kang while seriously trying to kill him?
Yes, no doubt LK is a better fighter then most in terms of H2H but I'm talking not just fighting skill but powers and feats...what a character can do over another.
Both Sub-Zero's have defeated FAR greater threats then Kitana, and Scorpion has as well not to mention their abilities giving them a huge edge over Kitana. Obviously any fanmade video isn't canon and just that fan made.
Fanmades are fun to watch though, you can do anything just like the Superman vs. Goku videos made by the many anime fans who hated the Death Battle video(I'm sure you heard about that, lots of fan rage lol)