Dixie dimaulo was the old guy in the driveway who went way back with rizzuto to the vilois days and probably inducted bonnano. Read he was rays d. Brother in-law wonder what he was thinking going against nick and Vito he been making money with them for decade s. Why turn on them at such a old age. He might have been a innocent but killed to send ray a message in jail. He wasn't hiding like the guy killed in mexico. Still nick Jr's murder was that the start. Did ray order that or was it nothing to do with the mass killing chaos.
Di Maulo was also with the Cotroni/Violi faction if I remember correctly and swapped to the Rizzuto's to stay alive so he has been known to go with whatever keeps him alive. I imagine after the Desjardins/Montagna power play he felt he had no choice but to go with his brother in law. Many folks at his age feel there is no reason to run or feel they are untouchable until he hit his knees in that driveway.
As for Nick Jr. I say it was one of two options, Desjardins or Montagna.