How good are CSM's in the Combat Patrol Format?

Hello, I'm a new chaos player, and I just recently picked up a copy of the CSM Combat Patrol which I plan on playing in a few combat patrol games. Before I do I just wanted to check on everyone's opinions and experiences with the Combat Patrol and how it performs.

I've played at least 30 games of combat patrol so far, (my local gaming store had 4 Combat Patrol tournaments in 2023 and it's my favourite way of playing 40k), almost exclusively as Orks, and I can only remember seeing one person play CSM, who I didn't get to play against, so I don't have any knowledge of how well they perform in the format.

So what do you guys think? Are CSM good in Combat Patrol? What are some good strategies when playing? Also, does the warlord, Ghallaron the Pious, have a 4+ invulnerable? Or is that only for his dark disciples? Thanks.