Using EA might depend heavily whether you've got active flow already or not, or the scaling of the combo when you use it. Since it has no minimum damage it won't necessarily add good damage unless it's used early and in active flow already for the 4K damage version. It will be useful though to use OD early in a match off of a confirm and finish it with EA to enter Active Flow and regain your burst quickly.
Most combo routes seem to want to incorporate 6A>6B mostly to get the bonus poration which seems to have an impact on damage since their opting to add in 5A and 5B P2 scaling into the combo instead of sticking with heavier B and C normals.
I'm not really sure if the Renka airdash route is better than the Hotaru corner combo routes since it looks like Renka might still has poor P2.
The video does show some pretty interesting routes to use. That's just my two cents.