Yep, I managed to solve my own problem.
I slapped myself in the face after I thought of disabling those specific addons.
I actually ended up disabling the wrong addons, and I ended up with 4 standard players.
I then got the idea to start a minigame with one of the weird standard players, and then observe myself in the mission editor.
Know what I found?
In the misc > datablock field (having my player selected) I found SlowBot in the box. Different one? FastBot. The 3rd one was the normal player, and the last one was good ol' DoomBot.
I now understand to change the uiName's in those files I mentioned earlier, but is there a way to make them not show up in the list, besides commenting them out/deleting or something?