I enjoy this, but 2 things.
1- Sub Zero was IN MK3, he just wasn't classic sub zero. Noob was only fightable, so he shouldn't count.
2- Frost's biggest rival is absolutely Sub Zero. And this isn't me using 11 for reference, this quiz was made in 2009, AFTER Armageddon, so this was common knowledge at that time.
Other than that, pretty good