You're thinking of the Lights. The Brights produce plenty of capable wizards, they just put personal skill and the ability to control their raw firepower over the actual amount of firepower they can dish out. As Boney stated, 'a high affinity in their wind is very different from what they think makes a good bright wizard'. That means if he doesn't have a great affinity, they will absolutely still be likely to think highly of him if he can kick ass and corral assholes, and likely be happy to give him Magister or Lord Magister rank for that. There's no hard power level you have to achieve to be in the high ranks.