So, a Thassilonian Specialist gets two prohibited schools based on his sin of choice. When taking an archetype such as the Spellslinger for example (which requires four opposed schools to be chosen), could two of the four opposed schools also be his prohibited schools? For example, you pick Greed, meaning that your prohibited schools are Illusion and Enchantment. Then for your opposed schools, could you pick Illusion, Enchantment, Necromancy, and Conjuration? In essence you're getting two opposed and two prohibited instead of four opposed and two prohibited.
Thanks for any help.
You couldn't combine those archetypes as they both modify the arcane school class feature.