What I like about Clem and Tess at that point was that they were smart enough to recognize Vito as their superior and go along with his leadership, instead of resenting him and working against him. That took practical smarts.
It was also a matter of pragmatism. Everyone was under Fanucci's thimb, and then Vito defeated Fanucci. It was clearly in their best interests to be aligned with him.
But most importantly: the also liked Vito.
"It was between the brothers Kay -- I had nothing to do with it."
