Did the composite base cause this e.max crown to fail?

This IPS e.max CAD crown was placed October 4, 2016.  Dutiful little dentist that I am, I based out a deep irregularity in the preparation, which had contained amalgam, with composite.  The composite material was Kerr's Vertise Flow.  Here is a photo of the fractured crown, removed with the Lightwalker crown debonding protocol.  As can be seen in the photograph, the cement base came out with the crown.  RelyX Ultimate can be seen adhering to the intaglio of the crown.  Could the base somehow have contributed to this fracture?  Would it have been better to skip applying a composite resin base to the preparation and imaging the rough preparation?  Thoughts anyone?

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