WOW.....
To me (A comic nerd) that's like hearing the song gold digger by kanye west, then hearing the song by Ray Charles and saying "hey, that guy stole that from Kanye West"
This is where last emperor got the idea from.
Secret wars is when the entity, "beyonder" came and stole all the super heros and put them up against super villans in a team battle.
http://www.mycomicshop.com/search?TID=177601
Marvel Vs. DC war is when the two universe beings fought by pitting heros against heros. Thor vs. captain marvel =thor, Robin vs. Jubilee = robin, Aquaman Vs. Submariner = Aquaman, Flash Vs. Quick Silver = flash, superman Vs. Hulk = Superman, Catwoman vs. Elektra = Elektra, Wolverine Vs. Lobo = Wolverine etc.
Secret Wars 2 is when it took every superhero in the marvel universe to stop him.