That's what I'm dreading. Erich seems far too nice to have to turn into "our" Lahabrea.
Hopefully people are right with the idea of him being Claudien instead.
How are you counting those?
By my understanding there's only one instance in which time has split apart to create multiple timelines and copies of characters. There's only one "screwed-up timeline" (the Eighth Calamity timeline) alongside our own, resulting in a total of two G'rahas and two WoLs.
The other timeline's G'raha woke up in the future of that timeline, travelled back to our time(ish) in the First, became the Exarch, and ended up on our side of the timeline split. "Our" G'raha was in the tower until we let him out again. Those are the only two. (Possibly very theoretically there might be a second copy of the Exarch on the other timeline, depending on exactly where it splits, and if so he likely died when the First was rejoined. The game has not discussed this bleak possibility. Either way, all copies are accounted for.)
The other timeline's WoL dies in the calamity. Our WoL is us. Again, there are no more copies. The events at Elpis and Pandaemonium are simply integrating into our past as it always was.
Knowing that the good guys will win is very different to knowing that the good guys will likely soon be tempered by an elder primal, suffer the destruction of their entire civilisation and possibly spend the next several millennia being very awful people.
In addition to the other hints mention above, one of the Tales From stories narrated by Emet describes him as a "youth of small stature" and he certainly fits that description.
I took that to mean "all the Scions", but perhaps...
Meanwhile I don't get the animosity people have for the closed loop story. I much prefer seeing it all come together and link up rather than starting new alternate timelines all over the place.