Originally Posted by spiritomb
Read the bold
Weaker to electric, but immune to ground.
Also, no it isn't. No filler character got Edo Tensei'd because they don't exist. Sakura remembered an event that A) Didn't introduce a new character. B) Didn't go to a new location. And C) Did nothing to expand on the stroyline or abilities of any character. That's just how this anime works. That's why Naruto never does any of his filler Rasengan techniques. Why Kakashi never busts out the Snowy White Whale. Some things just don't end up being real.