What exactly did JAB do to set GMAC up to be his successor?
What didn't he do?
And yes, going full bull-in-the-china-shop on your retirement exit followed by a rubberstamp decree that GMAC be your heir was not exactly the best way to make his case... This is the Hill we're talking about and some tact and political maneuvering was required to get that done and he knew that better than anyone. If he really wanted Gerry and put in the required effort needed for that, I am believe he could have made that happen.