Does Killer Chess (on the full board) favor any player heavily ?

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mgx9600

The chess variant I'm talking is this:

Killer Chess Breathing Room

http://www.chessvariants.com/small.dir/killerchess.html#variation2

 

On the surface, it seems as fair to the players as normal chess or no worse than chess960.  I'm hoping to hear opinions/proofs from people who's studied it more.