Danny is impressively dense when it comes to lies, but given enough time he'll figure out the truth.

He was also kind of sort of half dead before he came here. Assuming that's what "half ghost" means. Plus he's coming off of the tail end of Ultimate Enemy... basically "OH GOD I COULD END UP AS THE WORST THING EVER NOOOOOO" also alternate future him was totally killed by ghost half. THINGS IN A KID'S SHOW.