If urek is yonko level then someone like luslec and other family heads bar the 3 strongest ones are inbetweeners like law. They can put a fight but will get destroyed against full power urek.
Garam asked him to kill Zahard and all he said was "I don't want to"
Gustang is a pretty smug character but even he knows he doesn't stand a chance against Urek in a direct confrontation