You are both kinda wrong about it or at least you are mixing different stuff together which muddles the truth.
There is a 3.5 hours long podcast with Hickman out there. I personally haven't listened to it but the X-Forum has a thread about it
https://community.cbr.com/showthread...he-Cerebro-pod
The notes clearly say that Hickman decided against the benchmarks and workloads that his work would have entailed. It does say that the initial sales of HoX were lower than expected but that had nothing to do with Hickman leaving. Again the workload was simply too much for him.