Yes, the Shpilband/Zoueva split killed them both in the long run as a major force.  It might have been a different story if Davis/White had gone with Shpilband instead of keeping their friends close and their enemies closer 
 
Dubreuil/Lauzon already were training teams from before they founded IAM and before Papadakis/Cizeron joined IAM in 2014, like Hurtado/Diaz (2011), Fournier Beaudry/Sorensen (2013), and Paradis/Ouellette (2010, no other coaches listed anywhere I can find).
Whatever happened in France to make Haguenauer leave Zazoui and Schoenfelder in Lyon, with Papadakis/Cizeron asking to follow, was what really ended up putting them on the map.