They should have at LEAST Ritual, and it would be weird not to have Channeling too in a lot of cases. For a Pyromancer, they should definitely have both. A concept like Morty, who doesn't do any real evocation but can perform ectomancy at evocation's speed, is one where you might only have Ritual and take Superior Magic.
IIRC, Superior Pyromancy on the board is priced at -4. I think this was because the author wanted to boost Focused Practitioners, and was designed more like Sponsored Magic with Ritual + Channeling + Evothaum + Extra Benefit all for -4, but...I'm not a fan of that idea. I price Superior Magic at -2 (usually), it grants some kind of appropriately thematic/related evothaum, and it grants a 1 refresh-ish amount of Extra Benefit. You need to have a good reason and Aspect(s) to take it, and it builds on existing spellcasting as a representation of deeper talent, training, experience, etc.