TB, I think your analysis is astute as usual, but I also think its contains too much psycho-analysis with motive and intent. There are some large assumptions made about the power struggle (if there is one.)

I've never liked the hit at the airport and Rocco's poor death-act. IMO it just didn't wash. I think it is one of the weak points in the script. I know it suppose to represent Michael's unflagging quest to eliminate all his enemies, but Rocco was always loyal to Mike and the family. Did he really have a reason to throw himself on the sword? or did he really think he could out run airport security with his gimp leg?