Your correct, it theorictally impossible. This cannot happen he's prolly trying to make you think they are worth more than they are or something. Pictus geckos only get about 5 inches, and leos would most likely see them as some sort of threat possibly even prey. They have different care needs and under a condidion one likes the other woulnt, therefore they would not breed.\
Congradulations on your leos though! those look VERY nice! I'll have to get some pics up of my high yellow soon! Sorry havent been here for ages and I dont even know if I've made a post lol.