The new coliseum is eh. Shooters are one of the last classes I plan to use outside of speedrunning Kuzan teams, but Gladius is honestly a fantastic unit that every player should (eventually) max for when the tides turn for Shooter teams and they become more relevant. If you currently rely on Shooters to clear stuff, well, congrats yo. You just got your long-awaited major Coliseum powerups between Gladius and Byrnndi World. T-Bone is eh if you own QCK Khalifa but isn't a bad unit. Just not at all exciting. Orlombus is super niche and (thus) eh. He did get a Limit Break on JP according to the latest update, so that should be interesting to see if it alters anything to make him more viable. I'll try to farm Gladius using natural stamina, the other two will be cleared for rewards and put on the backburner. As for returning coliseums, this is the third time Apoo's returned to the Coliseum and I still haven't maxed his sockets yet. It's about time I get it done, for realsies. Moria's interesting since I never bothered to clear his coliseum in the first place out of apathy, but I think he's the third most interesting thing in the Coliseum for me after Apoo sockets and Colo Gladius.
What's interesting to me is that we jumped to Colo Orlombus, from Suleiman, from Don Chinjao. Another jump like that and we could be landing on Colo Machavise, which is the unit I'm by far most interested in, with Colo Kyros, Neko, and Lucy rounding out the runner ups. Other important Coliseum units like Ideo are also likely to drop on us during any future Coliseum batch. I'd go so far as to say that outside of Colo Ideo and Hajrudin, all of the other Coliseum units that we skipped over aren't super important and the best stuff is recent and within another skip's range.