First of all, for beria, although he is now an evil villain, the reason why he embarked on the road of blackening is entirely because he touched the energy core and gained the power of Ray Bloom after being expelled, and beria will become what it is now. However, in this respect, if we look at other former lives, once young and promising Otto soldiers, it is because of his existence that Ampala's talent will be defeated in the "Ottoman War". So for this, the existence of beria can be said to be very meaningful!
Secondly, for Siro Altman, when he first appeared, he wanted to touch the energy core. After being stopped by his father, Severn Altman, Ciro Altman was sent to Leo Altman for harsh training. Then, when beria invaded the country of light, Siro Altman appeared, successfully defeated beria, regained the energy nucleus and saved the whole country of light. Then it can be said that Cello Altman is definitely a hero to save the country of light.
Finally, for the significance of the real existence of these two Altmen, the appearance of beria is much higher than that of Siro Altman, so for this reason, if beria did not cooperate with Otto's father in the "Altman War", it is absolutely unknown whether the people of Ampala could really be defeated at that time. Therefore, for this reason, if beria hadn't appeared at that time and the country of light had long since ceased to exist, there wouldn't have been Siro Altman. So in my opinion, it makes more sense for beria to compete with Rothman!