6) Harry is playing against the intelligent but naïve Voldemort instead of against the intelligent and experienced Nathan Russell. (Actually, I don’t know who Russell is apart from being the first person to let EY out of the box, but he may well be experienced with this problem, for all I know, and he’s probably intelligent if he got into this stuff at all.)
Sure, but now your argument, it seems to me, is
6) Harry is playing against the intelligent but naïve Voldemort instead of against the intelligent and experienced Nathan Russell. (Actually, I don’t know who Russell is apart from being the first person to let EY out of the box, but he may well be experienced with this problem, for all I know, and he’s probably intelligent if he got into this stuff at all.)