It's okey all that about El, Solaris and Meteor involving on the Championship but the question is how in game Ame approve something like that with Laura. Or is complete secret the background of El/Solaris/Lin as Meteor members or some plot hole?
Anw what I think about is
El (Meteor Member),
Bennet (Under El's control is like under Meteor control),
Anna (Maybe will follow Laura's fate soon as Anna is someone who opposite Meteor so El can do something about that as he do with Laura wich also is/was opposite Meteor. Anna like Laura have connections with the 4 keys and Meteor don't want her around)
Heather (Low chanche but I think is like Anna and Laura and maybe she will have the same fate or El was about to do that but you (as hero/heroeine) will be on E4 before she fired from E4. Heather like Anna and Laura also have connections with the 4 keys and I think Meteor don't want her too. Also on the Jungle Taka and Zel said something like "You know who she is" (Well she was Corey's daugther who was a Meteor member so maybe they mean that)
Champion Lin/Solaris/Fern
I will explain about Fern. First I'm with the above posts about Lin/Solaris. Lin can be Champion and the "new one who emerges" can be either Solaris either Fern or you the hero. Lin as all know will die. She can die before you battle her or after. In every case either Solaris/Fern can be Champion for a while until you take the spot or even you can take it from Lin after she die
This can be with Solaris or Fern as well
Also Ex E4 members
Arclight (for me he can always be a E4 Member or Champion), Laura, Anna (Maybe soon), Heather (also maybe soon)