User blog comment:Xilinoc/Ch. 668 - BIGGER,FASTER,STRONGER/@comment-957629-20160331154647/@comment-11446176-20160404055428

Thing is with that, Zaraki had been carrying the actual zanpakutou around for a while already the first time he met her - so, nothing to say he hadn't already imprinted on her before that.

Also, her "you saved me etc etc" doesn't necessarily point to that point of meeting him as the point of rescue.