Say if everyone invest on day 1...i.e. 5million that is approx 8333.33 btc. 10000tokens per btc will equate to 83.33million tokens being issues which will be 50% of the total supply.
Total supply will be approx 166.66m max and on the opposite end it will be 99.99m min?
That sounds right, though where do you get 99.99m?
Key thing is that supply is fixed, and the Reserve is not spent on a permanent basis - it's just for balancing up on a short term basis. Essentially it can be discounted from supply because it's not an overhang, it's for orderly settlement and will remain ring-fenced.