I find your observation very interesting.
But I have to lean again to my position, because of all those you mentioned had or had some very persuasive tact with anna, except chris, rob just met anna pregnant and had tact, likewise Leonard who had in his own way, all that happened in his social environment, but at work, they had it approach before david met him, were hanks, jake and marvin, but it seems that he did not give more plot to these in the past, they only wanted anna, jake in his case, was known to have a partner, a reason to stay out of other people's business, hanks as the boss, where also wines that he wants some acceptance like his father, marvin nmnm as marvin, marvin was not given a good development as a character, and if with all this given to conclude that the characters who had that more physical approach, should have the same right that had chris (zzz), marcel, the truth I do not know what motivated him to palmer, but good.