You know I've often wondered that myself. Was Dom in jail at the time of his son's disappearence? The West Side still packs an enormous punch. Was it a situation where Nick is killed then Basciano raises his hands in the air saying "I didn't do it?" or was there backing from other leaders of the Genovese Family who told him to let it go?
I think the latter is more or less the best ways to explain it.
