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Obree never really became a pro cyclist - he signed to Le Groupement but never made it to the first team meeting and was promptly sacked (his account being that he was asked to dope and wouldn't). He outed himself years later anyway so even if he had been in the pro peloton he wouldn't have been out. I had an interesting conversation with him about this actually.
I haven't seen the Pellizotti (presume that's who you mean, Franco?) article but have never heard that and Google doesn't come back with anything.
I'm sure there have been gay pro cyclists, but as far as I can establish there's never been an out one.
I think the podium is probably the last of your concerns if you're a gay pro cyclist. The peloton is a cold place for a gay rider: at least, we can only presume it is as there has never been an openly gay pro cyclist ever, which is statistically highly unlikely verging on impossible.
So the 'what can a gay rider bring onto the podium' debate is a little premature.