Shadow Isles's champions interactions and Mordekaiser

There are some few points that aren't really clear, even after the lore changes. Are , , , , ,bound to 's will since he is controlling the mist or do they have their own objectives? What I understood from the Lores is that is trying to rebuild his strenght to start a conquest in noxus capital (in his own bastion). but since nothing were added in game, we have no specific interaction between these champions! In the twisted treeline map, we have for example the west altar saying:

"Mordekaiser is not to be trusted ,Hecarim" -> I think it would be nice to developp how met the other inhabitants of the shadow isles. Is serving the shadow isles serving the black Mist? in this case,they serve Mordekaiser.

-"Mordekaiser, are you also a prisoner" I don't know what interpretation I could give. Back ini the days before the new lore, I was thinking that Mordekaiser was a sort of king,betrayed and bound by some magic and he lives to avenge himself and uses pain to stay "alive". Maybe now he is a prisoner because he is worried about the safety of his bones...?

Same reflexion about thresh and Karthus (not about pentakill lol), it would be nice to get more details about their meeting.

Concerning Kalista,it's kinda hard,it's a spirit that want to get revenge,but it doesn't mean the she's not working with/for Mordekaiser,since he control the black mist.

If anyone(riot staff or else) have an official source to answer these questions,you're welcome!

PS: -i don't consider as being in the same team,she's not an undead and only worship a giant spider) - I'm waiting for and new lore.I hope it'll give more data on it!