I was just reading the revised rules, and while I think they go a long way to fixing the errata and confusion from the first set, it seems to me that the example of combat with Cthulhu is flawed.
1.) The example states that Havey Walters started combat with Cthulhu with 3 stamina. How is this possible, when C's special ability reduces your maximum stamina (and sanity) by 1 for the whole game? Harvey would start with 2 stamina, in that case.
2.) I have always played that Cthulhu's combat ability applies to your maximum sanity/stamina, regardless of where it stands when you go in to battle (therefore there would be always be 24-27 rounds of combat with him, regardless of the number of players- 7 days worth). The example would seem to imply that Harvey went in to battle with only 1 sanity. Why would Cthulhu's battle damage apply to 'maximums' if you're still battling him with the sanity and stamina that you have when the battle starts? That would be the same as battling every other AO, so what's the point of using maximums? Considering his battle ability of putting one doom back at midnight, I have found him pretty hard to beat even with a guaranteed 24 rounds. You'd have to hit him an average of almost 3 times each day to pull it off, which rarely has happened when I fought him- his task is the least likely to come up of all of the AO's (which only makes sense, given that he is Cthulhu).