Didn't Michael continue to employ this type of manipulation throughout the trilogy? Have subordinates put their head in the Lion's mouth in exchange for having them appear loyal?
Yup. It goes on throughout the trilogy. Michael did that to just about everyone-Clemenza, Tessio, Tom, Frankie, Rocco. I really think of Michael as a fallen angel. And like a fallen angel he can still be quite charming and persuasive when he wants to be.