I screwed up.
I didn't notice that snom has been using an Excadrill, which does not fit either the height or weight requirement, since the first round. Therefore, JACK should have had the choice to take the win or redo that battle. I think the fairest thing to do now is to give JACK the choice and determine who wins that matchup based on what JACK does.
take win: JACK wins
redo battle: whoever wins the battle wins
JACK does not respond for at least 1 week, but snom does: snom wins
neither respond for one week: JACK wins
After we decide the winner of that matchup, we should give Prof and Codeine the opportunity to win their battles without having to battle against an Excadrill, so the resulting bracket looks like this:
((round 1 winner vs. ProfDelldell) vs Codeine Kiss) vs KRLW890
Additionally, the Crown Tundra was released after round 3 started, so no new stuff is allowed until round 4, which is the battle against KRLW. If you're snom, JACK, Prof, Codeine, or KRLW and think this decision is unfair, please comment on this answer.