because he supposedly held a lot of clout with the twins, who were the only people who could get close to roy.

I'm sure Gaspipe had a lot a clout with a lot of people, but I don't recall reading in Murder Machine anywhere that the Twins ever had any interaction with Gaspipe or any other Lucchese members. So I was kind of curious as to why Gaspipe was brought in. I'm guessing because of his "resume?"

Initially Decicco was given the contract but couldn't get close to Demeo.
Then it was offered to to Gotti but he couldn't get close either.
Big Paul was starting to get frustrated when Decicco suggested reaching out to Gaspipe who knew Patty Testa and by extension Joey Testa.
Decicco argued if the job was given to Joey Testa, he would have no problem getting to Roy as he was the crews number 2 guy.
It worked!

I wonder to what extent did Patty Testa have with the crew, when they were all rounded up in '84 he was only charged with a single count of car theft, probably plead out and did a year max. I am also suprised Paul didn't immediatley go after the whole crew.