About Gallo giving it away ? I also asked the same question when it was first reported that he did.

Many members from the Cotroni camp had to decide whether to stay with the Rizzuto's who were receiving immense opposition or go with the new guy from the Bonanno family. Tough decison to make back then.
Remember , the Cotroni's got along fairly well with the Bonanno's for decades. So people like Di Maulo , Gallo, Arcuri's were accustomed working with the Bonnano's.
Others like Vanelli & Mucci , who stayed loyal to the Rizzuto camp, chose wisely. They are still alive but they also had attempts on their lives.

The Rizzuto's proved to be resilient and eliminated many who had opposed them but it came at a great cost for them too.
In hind sight Di Maulo, Gallo and others would probably still be alive if they had stayed with the Rizzuto's.

Presently or in the near future, they may have tentative agreements here and there; but too much blood has been spilled. Many in the Rizzuto clan who are in power have lost their fathers and relatives. The vendetta may still linger for a while.