It is kind of an odd scene, Pete. I think Buscetta waiting outside was Michael's way of putting Mrs. Pentangeli at ease--he's a pretty scary looking guy. And, if he'd gone in with Michael, probably some of Frankie's bodyguards would have had to come in, too.
Surprise here is Mrs. Pentangeli knew Michael Poor scared women, worried, having him in their house for half an hour, on their own Also what is Buscetta going to do with a coat hanger and a pillow
