While it definitely seemed like some people may have been opening cases with a macro, that really shouldn't be the case for your entire friend list. I opened hundreds of cases manually even though some of my friends had their cases opened in...eh, lets say "suspect" ways.

When it comes to Wako I'm not sure what you mean... she was added to N Gacha as soon as EG4 Part 2 started and it seems like its regular procedure for Nutaku to recycle some of the slayer cards... Last time I remember them adding the N card to both the N Gacha and the Event Gacha so this seems like the standard way they do it.