I guess many simply speculate here and don't know that in KPPSC all rules are written they have to follow those. No registrar or so called sources are of any use.

I personally have experienced the working of commission in recent past by qualifying two ability tests (AD- Police Department) and (SS-History). In first case i secured 58 and cutoff was 52 in other I got 52 and cutoff was 41. I wasn't able to go for interview. Reason: not having MPhil for first mentioned post though I have two years research experience but that was the condition. And in second post B.Ed was condition which I hadn't. In neither case they announced a pre-planned cuttoff, cause as per their rules they cannot.

Same will happen here, it all depends how many candidates are more than 40 benchmark. If 400 are above 40 in each zone, merit will be decided between those 400. It's very simple