Put Crystal Tower into MSQ roulette

[Scaramouche]

If you can't proceed with the MSQ without completing it, then it's part of the MSQ.

Specifically for Crystal Tower, it does set up some major plot elements for Shadowbringers, so yes, it very much is part of the MSQ now.

To progress 2.5 you need to complete CT and Ifrit/Titan/Garuda

Either both should be msq or none.

Also msq roulette always been last instances of 2.0

If msq means mandatory for the main quest then you can add sastasha, tam tara, copperbell, ifrit, totorak, haukke, Brayflox, Stone vigil, Garuda, king mog, leviathan, Shiva, keeper of the lake, snowcloak, ramuh, etc.. They are all part of msq and are required to progress.