I think that the validity of any ship or MMC/FMC in the ACOTAR world can be easily determined by their proximity to all the outstanding storylines that are currently available to us.
Dusk Court Azriel/Nesta/Rhys (Elain)
Truth Teller/Gwydion Azriel/Elain
Autumn Court Lucien/Elain/Helion/Eris/Az Gwyn, nameless GF
Mate bond (reject.) Elain/Lucien/Az
Mate bond (2nd?) Elain/Az
Eris Mor/Rhys/Beron Gwyn (unless he is her dad)
Valkyries Gwyn/Nesta/Emerie
Vallahan (unsure of storyline) Mor
Midgard Nesta/Az/Rhys/Amren/Mor?
Hewn City Mor/Rhys/Feyre/Kier
The IC Rhys/Cass/Az/Mor/Amren, the Archerons
Illyria (unsure of storyline) The bat boys, Nesta/Emerie/Gwyn because of Blood Rite win
Band of Exiles Lucien/Vassa/Jurian/Elain via Lucien/Vassa
Dead Trove Nesta/Elain directly, IC indirectly
Lightsinger Possibly Gwyn
I am sure I am forgetting something, but it seems to me that Elain is connected to 87% of all storylines directly, and the rest indirectly
Gwyn is connected to about 5%
Lucien/Az are connected to about 40% and 70% respectively
Rhys and Feyre are directly and indirectly connected to 90%
Mor is connected to about 50%
So let's do the math: Elain leads via direct association with 90% of all storylines, supporting characters are Az and Lucien
Secondary characters Mor/Lucien/Vassa (more than half of storylines)
Overarching characters: Feyre, Rhys, the IC, Nesta
Tertiary characters: Eris, Helion, Tamlin?
Level 4: Emerie, Gwyn, Beron, LoA (both might be higher depending on storyline), Kier (might be higher)
Am I exaggerating Elain's importance?
Yes, you are biased
No, she is connected to all of these storylines and will be the FMC
It will be a multi POV with 5-8 equally divided storylines
Gwyn will be the FMC
Voting ended onAug 10