The Big Fella, Giancana had no choice. He had to leave Chicago or go to prison. It was a consensus opinion of Ricca, Giancana and Accardo. It was agreed that Giancana would expand the Outfit's interests abroad.
Big decisions in Chicago were made by a meeting of the minds of the Top men. It was not a Dictatorship.
The sooner you forget the Dictatorship concept, the sooner you will understand the Outfit's Leadership.
Stop making it a competition between these three men, that's where you failing to see the point. No one of these men ordered each other around. Get that out of your head.