Time travel/alternate universes (I'd lump the two devices together) have happened many times that created different versions of the characters (most notably, the evil beard versions, or Q turning Picard into a pussy). The only difference in this case is that it wasn't all put back together again in the end. That doesn't violate anything.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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