It would sort of be interesting if:

1. The Egi was redesigned and larger
2. You control the Egi, and the SMN does the sort of "auto damage" roll and sort of hovers off to the side (or on the shoulder of the larger Egi?)
3. Have it so you have to have your Egi out to do more than just your basic damage of dots. Modify ruin etc to be specific spells or attack from the Egi you now control directly

While I play it, it definitely was not planned out well.