I mean, they both really are not so normal people.
Quirinus Quirrell is a duplicity in human form, and the one who he carried at his body? Baldy Voldy! If Dumbledore knew that, why did he hire Quirrell as a DADA professor? Perhaps he wanted Quirrell (with Voldemort) to die?
Gilderoy Lockhart is a narcisstic fraud in HP universe. Can’t believe he’s not Sly but Rav. Why did Dumbledore hire Lockhart in the first place if he knew that he’s a nothing but a fraud? Perhaps he wanted him to lose his memory?