The guy you marked as cmp is must be Zimke, as he is the only one who looks Serbian, besides, how on earth can you pair cmp's character with that clothing style. Seems to me the guy on the far right must be cmp, as he looks as Italian as it gets.
Yeah, I was thinking the one on the right looks southern, but is cmp really that old? I thought he was in his twenties.
I also thought similar things as you about the middle guy, but after eliminating the one on the right, it leaves the him as the most likely one for cmp. Like you say, he looks kind of Slavic, and cmp is from the Slovenian border, so it could work.
He's probably one of those two, though.