That really is a bit of a stretch, surely? I mean really, come on. OK yes, the rest of them that have been in there this year are firmly D-List and Z-List... but James can surely only be considered a solid C-List? He's a minor character actor... yes, he's been in a LOT of shows, but not even really any supporting roles let alone feature roles? His GoT character had impact on the story but, if you add up all of his screen time, I doubt it amounts to more than 15 - 20 minutes... and not even all of the GoT
main cast would be considered A-List celebrities.
Peter Dinklage, Lena Headey, Emilia Clarke, Kit Harington, MAYBE Sophie Turner since X-men could be considered low-level A list. A lot of the others B list but no more.
James Cosmo A-list...