Arlovski would have had a chance because the guy was and still is very talented but I have a hard time picking against CC here because honestly even in his prime Arlovski never had a really good chin while CroCop's was solid so I think it would have been a great fight right up to when CroCop inevitably knocked Arlovski out.
"If you get hit and it hurts hit him back you not knocked out yet."-Joe Doerksen
The Toxic Terrors (FFL)
Demetrious Johnson*Eduardo Dantas*Rafael Silva*Zach Makovsky*Michael Page