Gotti jr claims his dad knew it wasn’t the Sicilians since he sent people over there. And Sammy says it wasn’t Joe Bilotti after they questioned him.

Therefore Gotti had to know it involved the other family/ families. But doubt he had any concrete proof

A lot of times ie like Gaspipe was able to identify who tried tonwhack him based on his ‘source’ ie police report

The cops didn’t get anywhere on the bombing. And when they say ‘an investigation was launched’ all that means is they put the word out IF anyone hears anything report it to your capo etc obviously that came to nothing

And even if it did, I’m with you in thinking Gotti was happy to let that one go (secretly hoping they’d be happy with Frankie D)