Cohen was a former member of Siegel's crew who was smart enough not to be around when Siegel was hit and strong enough to rise to the top over Dragna and LA cops for a short period of time. The book by Tere Tereba is informative.
"When the snows fall and the white winds blow, the lone wolf dies but the pack survives."
Winter is Coming
Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die.
As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.
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