Sorry for disappearing, got a sudden autumn cold and then had a lot of work to catch up with.
soro: Monster of Legend demands at least 4 levels of monster classes before you can take it. Also plase specify to what are the spellcasting prcs applying to. And speaking of which, gestalt rules state that "Gestalt characters with more than one spellcasting class keep track of their spells per day separately.", which means you cannot use spellcasting prcs in one side to advance spellcasting in the other, just to be sure.