on the site "Starting price 1 CREA = Total contribution crowdfunders / 12.226.641 CREA", but Distribution ICO is 7.947.316, so may be it must be "Starting price 1 CREA = Total contribution crowdfunders / 7.947.316CREA"?
Yes. But we do not know what the exact departure price will be until day 2.
If you want to calculate the price should be in relation to the total of existing CREA. In this case will be 12,226,641 CREA in block 0.