I agree; that miniseries really dropped the ball. However I would suggest that there may be a disconnect here between the writer's influence and the editorial influence. If editorial banned any direct reference to Northstar's sexuality (which is almost certainly the case) then the writer trying to still convey some sense of it within those restrictions should still be worth something. Its not as much as it could or should have been--but its as much as he could do with the restrictions he was under.
Now, that's
assuming it was editorial influence and not Furman's own choice to never use the word "gay" and just make references to his "lifestyle". But given that he introduced Raul as the guy waiting for Jean-Paul in his bedroom, and the two of them having a conversation sitting beside each other on JP's bed, I do think he was trying to at least imply a more-than-friends relationship there.