If we were tapping into Nidhogg's Aether as DRG, we'd be powerless now since the Eyes are drained (also, its never mentioned that the WoL is actually drawing upon the Eye as a DRG at all; heck, Estinien only does it with the Eye in his possession, not from afar). The blue aetheric tails are very symbolic of Midgardsormr's power, especially now that we have the purple being of Nidhogg (heck, in theory the WoL DRG can use a lesser Akh Morn since that is tied to the Celestial Dragons. Would be interesting to see that happen). I mean, we also have Dragonsong Dive to point to some concrete evidence we're drawing upon our bond with Middy...