After reading the urek spinoff I genuinely think his statement that he could just beat Traumerei and Gustang wasn't just talk
In the main series Urek was always described as on par with the family heads so you'd assume a 2v1 would result in a loss but by the way urek rarely ever uses actual power combined with the fact that I'd assume the 100% power was just shinsu and not the light
the light being something completely foreign to the tower is clearly something that can't be understood in terms of the tower and clearly urek doesnt use it generally which i think means it isnt a known quantity thats used when estimating his piwer
so if urek was to actually use it along with his full power I'd assume it would put him right in a level above the fhs making it completely possible that he wins a 2v1