WAIT A GOD DAMN MINUTE
You can't actually date Carl, even if you finish his route with the good ending?
You should acknowledge the fact, that Echo is not a dating sim, even though Chase is gay it doesn't define anything. We are here for the plot, not horny furry husbandos (well, most of us, Leo fanclub, lets connect ourselves!)
btw spoiler for others
I think Carl is not gay, he is the most probably straight or eventually BI. Sex with Flynn and make out with Chase is only his experimenting / seeking his sexuality / pure curiosity, idk tbh ;)