User blog comment:ZeroXuor/Is Colosseum Rigged?/@comment-27691408-20160423170524

I'm not sure if its rigged but I do think the fact the angel idol squads have been ignored by Alim & Gumi who claim to want diversity in the arena does tell me a few things that are speculation.

1st I don't think they will consider doing anything till after unit of choice ends for economic reasons.

2nd They want the arena types to each be separate.

CO: P2W

R: Casual

CA: F2P

Just wait it out.