One thing that is bugging me is why the fascination with Sasuke now? Oro previously wanted Sasuke for his Sharingan, as he couldn't get it from Itachi. If the Sharingan is all that is needed, surely Madara could supply a couple of eyes instead of giving him Sasuke?
1. I don't think Kabuto knows Madara has a bunch of Sharinga. And 2. I don't think Madara has any intention of giving Sasuke to Kabuto. Or giving him any spare Sharingan. He's not going to give Orochimaru II his clans Bloodline ability.
Also, Kabuto's reason for wanting Sasuke may be simple revenge. The guy DID kill his master.
It does seems like a stretch. For all we know, lightning techniques have always been blue. There's no real way for us to tell if that's just the animation department's take on his teleportation/projection technique.
If it's not Isuzu-chan Mii~
Well, that was him using his teleportation technique, which since then we've seen has nothing to do with lightning.
I remember thinking he had some kind of Lightning Step at the time also, but when I checked the manga, there's no lightning in that scene, so I'm guessing it's just the animation team embellishing.