My main sticking point to just combining (and why I didn't put Karkat<3Terezi as part of my OT3 signup to begin with and why I'm not emailing the mods about my signup now) is that I like my Karkat/Terezi as a quadrant-vacillating mess. So, uh, I'm not sure how good of a teammate I would be having to stay with Karkat<3Terezi there. ^^;

It's definitely something I will strongly consider, but the more I think about it the more I doubt I could make a good straight-up Karkat<3Terezi contribution to the team.