This is like Dumbledore gay to me: if the author wants that, fine, but put it explicitly in the series. Claiming it by word of god after the fact is stupid, annoying, cowardly and done only to be edgy.
As for Marco/Ax, don't get me wrong, I think they had a special relationship, but I doubt it was sexual, or romantic.
There where times though I thought they were better friends then with Jake/Tobias, respectively