User blog comment:ZombiRoll270/John Marston vs Zombies/@comment-184.45.38.184-20131225072645/@comment-422690-20131226053622

So it seems there are two separate challenges to the battle here:

1) Challenge based on Undead Nightmare having Marston v Zombies

2) Challenge based on fairness

Challenge 1 (from Affectos below and the Anon) fails because Undead Nightmare is non-canon, and this has been stated several times. Issue 2 (from Geomax) is still in question; personally, I believe that Romero-style zombies should be given better odds than 12:1 against gun-wielding opponents, though not by too much, since this is Wild West era. I'll leave fairness to those who know the warriors better.