I don't know whether a male will retain his colour without a female around??
I have very short term experience with a pair ( male + female that started changing), so probably too early to make generalizations. They are in quarantine atm but have settled in and are voracious feeders. My guess is these will end up bold and bossy, compared to other anthias.
If you bought two males I don't know whether one would ultimately revert to a female; or possibly they could injure each other during a struggle for dominance. Then the weaker one may stop feeding etc... and possibly die.
HTH and good luck!