Yeah some stories are likely to be skipped which is fine IMO since they don't impact the major first plot much.
One thing I'm curious about though-
Was Hakumen no Mono not covered in the OVA or did he feel the OVA didn't live to his expectations?
Taking the 2nd ep. for example, I feel this one can be cut since it was moreexposition for Ushio and the girls' relationship, and unless this Youkai gets mentioned later on or has a role or something I'm curious why they decided to animate it instead of going straight to the painting story
The stone armor demon plays into the finale. They can't cut too much in the next two or three stories as it all plays into the end.