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Good question. Evidence suggests that it's not a fixed rank or anything - Chrono, who ranked higher than Nanoha or Fate in S1 and S2, was still using the standard-issue S2U storage device. Tea and Subaru and Elio had custom devices going into training. Probably, it's a personal-choice thing - you get a standard-issue device unless you have one already, in which case it's okay to keep using it. (Dunno about Caro, but she wasn't in training before Div 6, so maybe she didn't have a device at all?)
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