It was a necessity. During Mangano reign, both would beef on the other every once in awhile. Anastasia put Scalise in that spot cause he needed the extra layer of protection from Genovese and Lucchese. The Sicilian faction of the family did not raise too much of a stink, cause Anastasia said he would harm a member if they came back to NYC, but went back on the deal and had him killed anyway. Scalise was boss then capo, then Anastasia put him in Underboss in the 1950s.