In the first case, the problem is “symmetrical ultimatum game against X”, in which $9 rock does get $9.
In the second case you are correct, in the problem “symmetrical ultimatum game against $9 rock” $9 rock gets $0.
In the first case, the problem is “symmetrical ultimatum game against X”, in which $9 rock does get $9.
In the second case you are correct, in the problem “symmetrical ultimatum game against $9 rock” $9 rock gets $0.