Isn't the issue not so much as to whether or not Rumsfeld was pushed out the door, but rather whether his exit (self chosen or not) was associated with a change of administration policy? If Rumsfeld "chose" to go, perhaps it was because he did not agree with the change.
The answer my friend is in the replacement, Gates.
Maybe, he thought at 76, that he didn't want to have to do battle every day with the likes of Rangel and Waxman.
Maybe, this man, who does not suffer fools lightly, just wore out against having to continually talk to idiots who do not grasp what happened on 9/11.
I guess we will have to wait for his book. Should be a humdinger, don't you think?