300M shares per D's assumption $1B/year per D's assumption 15% royalty (0.15 multiple) per my assumption 5 x earnings multiple (x 5 years) per my assumption
You can adjust them how you like but that seems pretty conservative. I'm ok with pretty conservative though when it nets me a 25x my investment. Feel free to dream of 50x or 100x if it suits one's tastes.