"Send someone with him anyway," but where were they?
Thinking about the hospital scene, I was thinking that earlier in the day, Michael is at the house and Clemenza is showing him how to make spaghetti sauce for 20 guys. Sonny comes in just as Michael is leaving, and Sonny wants to send some bodyguards to go with Michael. Michael refuses, and Clemenza said "it's okay, Sollozzo knows he's a civilian." Then, after Michael leaves, Sonny says "Send someone with him anyway."
But then, later on, Michael shows up at the hospital, and the only person there (other than his father and the nurse) was Enzo. Where were the guys that Sonny said to send anyway? Did they not get sent?
It seemed a prudent move on Sonny's part to send someone with Michael, as they certainly could have come in handy at the hospital.