Just speculation but if Night accumulates all light to hit a single target it may not be really effective against crowds or large scale targets. It would explain why Maya is not a strategic class mage, she's nigh unbeatable in a one on one fight (except against Tatsuya) but would lose to an attack on multiple fronts. Masaki would lose to her in a dual but since Rupture can eliminate multiple targets he might be considered "more powerful" if the question was based on a battlefield situation rather then just who could beat who.
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