might want to change the 17 to a 23, the max rank of a Greater god is not 17 but 23 i believe(24 onwards is an elder one).
We have an official reply from Upper_Krust:
"Hey there Obly99, first let me apologise for the slow reply - missed this altogether.
There is probably no right or wrong answer here and I could possibly argue (under my rules at least) that both of you are wrong. There are no ranks 13, 14, 15, 17, 18, 19, 20, 21, 22, or 23 in my rules because it would mean crazy subdivisions of quintessence amounts.
So greater gods would always be DvR 16, Elder Gods will always be DvR 24.
Now I know the original 3E Deities & Demigods had the ranks as a range, 1-5, 6-10, 11-15, 16-20 etc. But they never had rules for allowing players to become immortals.
So the short answer is you are both wrong, but I think it is fine to house rule this stuff as you please - although you will likely run into the problem of subdividing quintessence I mentioned above."