Ok, me and two fo my players have been arguing over sorcery/psy rating rules for awhile now, as we can't agree on the definition of the rules. So on the one hand, one of my players says that according to the rules, taking a sorcery rating will boost his next buyable psy ratings by one (i.e. if he bought sorcery at rank 4 and whatever his rank 5 would be, if it offered a psy rating of, say 4, that psy rating would be bumped to a 5 to compensate for the sorcery rating basically giving him a psy rating of 4 already) Through this he says he can achieve a psy rating over the normal 6 you can get.
My other friend says that sorcery doesn't boost all the other psy ratings and basically just renders the next psy rating moot by taking sorcery. The rules in the book seem like it could go both ways, it isn't really clear. I'm hoping you guys have a better understanding of the rules, and can help me out here.