Al would have to restrain himself from overtraining and over-racing. Could he do that? If he could, his career could have been pointed towards a marathon medal in L.A. in '84, perhaps gold.
But, that is like saying Pre could have saved himself for the last 150m of the last lap of the Munich 5k, and he could have held off Ian Stewart for the bronze. It just was not in Pre's mode of operating to do that.