Given that there is a certain probability for the answer to this question to be positive, what might then be the frame of relevance of the matter?

No

THERE IS A POSSIBLITY THAT HE IS GAY BUT GIVEN THE TIME AND PLACE WHERE HE WAS BROUGHT UP AND LIVED IT IS MOST LIKEY THAT HE IS NOT GAY.

Why question the sexuality of a great person?
Leonardo's sexuality is part of his private sphere, and out of respect, should not be questioned by anybody not belonging to that sphere. I'm compelled to answer your question as follows:
It seems to me that it's more probable that you are gay and you're looking for historical ideals!
please look somewhere else,. Give this Icon of creativity and intelligence the credit to his genius, and please don't relate genius to a certain sexual orientation, it's bizarre.....

No it is not possible because he was a beleiver of god.he did not beleive in those things.his mind was pure and not filled with bad things.a pure mind tells why he is not a gay.