I can rule out a few. Abdulkerimov isn't fighting anymore as far as I know. Johnson and Tony Lopez are signed to Russian orgs and those contracts do not have a PFL out clause. Anyanwu is with the UFC now. I don't believe Odoms and Jeff Hughes have out clauses for PFL in their LFA contracts. Here's my thoughts on a field:
Ivanov
Jordan
Rosholt
Alencar
Gooch
Countinho
Copeland
Kyle
Shelton Graves
Daniel Gallemore
Kelvin Tiller
Shawn Teed
Yep Zulu joined the UFC as a replacement. Apparently Arsen signed with Ali and will make a comeback but no date confirmed.