I don't know. I feel it is in line with a young 20 something fop/dandy who constantly tries to flirt with Laniatte and is a court gossiper. Now is he as skillful or as open about flirting with or trying to do so as Jannequinard? Heck no. If this musing had been coming from Artoirel then yeah it would definitely be out of character for them as out of all three Fortemps boys he is the most straight laced and unflirtatious. He also doesn't wonder why the openly known bastard son who is his half brother has a silvery blue mane of hair as that's the dead give away Edmond had been unfaithful. Since all of house Fortemps seems to continually have only black haired offspring. Unlike the other three houses seem to have a little bit of mingling of house lines. Haillenarte being mostly blonde with a few redheads or strawberry blondes in Laniatte and Francel (who for whatever goes by the last part of his forename). Dzemal being mostly white/silver or platinum with a few pink haired via Jandelaine and Guillefresne. Yes everyone's favorite stylists are cousins to Archombadin and Grinnaux. With Durendaire being mostly redheads and an occasional blonde considering the current heir who isn't a Limsan pirate captain is a icy blonde.