It cracks me up when a wiseguy is labeled a bullshitter, show me a stand up gangster and I'll show you an undercover cop. Tommy Agro confirmed Gotti was present at the murder which was slow and painful, so while Gotti might have, or not, been the actual trigger man,. It would be reasonable to assume he was upset at the murder of his friend Billy Bats and probably got a few shots in before DeSimone met his maker.