Perhaps as part of the thread requirement you need 'ingame shots' if the person doesn't provide any, I'd probe them to get one, - if it is suppose to be genuine FPSC content, I'd keep it there (if they refuse to give the FPSC versions or FPSC screenshots, I'd probably go for the lock- because they're essentially breaking a certain rule for the board and are refusing to fix it), I think this thread for example could have been probed for FPSC screenshots. - but as said it may need retexturing, even if he refused, I can still see this thread staying up (even if it may make the odd bigot FPSCer a bit annoyed, as I've seen some get) because it has a screenshot of the model, the model as FPSC ready and explains it may need a retexture (In my mind I don't see how an FPSC screeenshot will make a difference to people wishing to download it)
If its a genuine showcase of work - like a rendered 3D character for people to provide critique then I think the move option is good idea.
These are just thoughts - I don't mean to sound if I'm telling you how to do your job - but I thought it may help if I vented a couple of ideas if they haven't already been addressed by FPSC mods.
It is a bit of a difficult situation to resolve, I agree, but I hope our suggestions are helpful and thanks for listening, Fred.
Look behind you a threeheaded monkey!