may/would have been a dictator

[Jaydee]

I read this sentence in an article

"Saddam may have been a dictator..but look at Bush."

I understand that "may have been" indicates probability in the past.
Would is also said to indicate probability.
So if I say " Saddam would have been a dictator....but look at Bush" , will it change the meaning of this sentence.
Please explain to me the difference between two sentences.
thanks very much.

[Mister Micawber]

'May' (or 'might') in this structure does not represent probability. Here is the applicable definition:

3.
(used to express contingency, esp. in clauses indicating condition, concession, purpose, result, etc.): 'I may be wrong but I think you would be wise to go.' 'Times may change but human nature stays the same.'
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Native English teacher at Mister Micawber's