If he was killed in the Bergin basement with a chainsaw, it was not Tommy Agro. TA was based in Florida and hardly knew Gotti and never would do a hit with him, why would he?

I believe Coffey is right. Likely killers? Take your pick, Lino, Boreillo, Johnson. Gotti wouldn't have done it though

Agro was probably talking tough. Also Billy Batts was not close to Gotti, he was a friend though of Carmine Fatico. Gotti wanted Simone, because Foxy had been much a closer friend to Gotti than Desimone ever was. Gotti's kids even loved Foxy and Gotti probably didn't like Desimone much. Why would he?

So truth of it is, he was killed by one of Gotti's gang in the Bergin bar. But Agro had nothing to do with it and neither did anyone else