Fair enough. How much % census would you consider enough? Catalan pro-independence had higher % than say for instance Brexit vote. And a good chunk of the % was lost to Spanish Police "raids", quite violently boycotting the peaceful vote.
Or, if they had chosen to go for elections next December where votes unequivocally pro-independence parties where higher than votes for the rest of parties, in my opinion it would have been morally claimable.
In other words, I'm a lot more comfortable with some clear means to count unequivocal Yes votes against unequivocal No votes. If a party has "Independence" in the election program is an unequivocal Yes. If a party does not have "Independence" in the election program is an unequivocal No.
I voted in the referendum but I'm not comfortable with the huge "No show" of No votes on the 1-O referendum. To me, the results of the referendum are not conclusive for such a decision.