#1 in Terms of what? Overall peak of popularity? Without 100% transparency we will never know, most will say AoC's were a bigger gamechanter than fast exp/and fast expansion unlocks. Some might even say a PoP locked server was the best idea ever too. I will say one thing, nobody will ever talk about how Miragul/Aradune and Rizlona will be the best TLP's ever thats for sure.
Or Coirnav Phinny probably is #1 TLP, the OG, time will tell but I'd bet no other TLP makes it to live with as many people.
Selos is already a live server, free transfers enabled and is scheduled to merge into Povar at some point in the future. That coffin is already fastened pretty solid.