I did read a dog's age ago that in around late 1966/early '67 Gambino briefly relocated to FL because of heat from the Feds, and this would correspond with Paul being in charge in early '67. Also, the informer's other info lines up...Neil became Underboss in '67 and Joe Gallo became Consulieri in 1967 as well. It's very likely this meeting was among the higher-ups of the family to discuss the new family structure. And it's likely that Paul remained Acting Boss as Carlo became a virtual recluse after this period. By the 1970s was he even really seen that often outside of his usual public events? He probably put Paul in charge both to test Paul's leadership skills, and to throw the Feds off the scent (IE, the old Don has retired, let's focus on the new guy).

Also, Paul being Acting Boss from 1967 forward would tie into why a lot of Neil's guys weren't happy with his being named official Boss - they already saw a taste of what dealing with him in charge would be like, and didn't like it.

It also shows that as early as 1967, Carlo was looking to the future - white collar crimes and a lower profile.

Neil wasn't his old time buddy like has been portrayed - he only became Underboss in 1967 because the existing Underboss couldn't do it anymore. And even then, he was in and out of jail.