Okay, so my current interpretation is that Shai did create a facsimile of Ashravan's soul and then stuck it to his damaged Spiritweb/remnants of the Spiritweb dissolving back into the Spiritual. This new soul was superimposed over the old one, repairing frayed Connections between the Physical, Cognitive & Spiritual and tricking his Identity into accepting it, creating a patchwork quilt of a soul for Ashravan.