Ferguson was able to handpick David Moyes as a replacement after seeing his rise to accession from Preston boss to managing Everton.
"If we believe what we've read, Sir Alex Ferguson, more or less, recommended and appointed David Moyes," Purslow told talkSPORT.
"If you contrast this with their peers like Bayern Munich, who targeted Pep Guardiola from one of their rival clubs, with the best will in the world, one gets the sense Bayern Munich went about it carefully, cautiously and took their time.
"This isn't Sir Alex Ferguson's fault, in any sense. I keep reading about him leaving a bad team but what was he meant to do? Leave when they were poor, rather than leave on a high?
"[Any other company] would run a search. They establish their criteria. They interview three or four candidates, whittle it down to one or two and, through the process, often you will learn a lot."
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