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I do not know why, but some active Editors have a Page Rank 0 despite the fact their categories have good page rank; other not active editors still have good page rank.
What's the mistery?
From what I have observed, mostly the PR of ODP editor profile pages comes from internal links at the ODP. This tends to lead to leveling out the PR of ODP cats. Thus cats low in the tree often have good PR because they are adopted by editors with relatively high PR editor pages. You can see this a lot in regional cats. From an ODP perspective this isn't bad. Leveling out the PR value of cats means that what cat a site is listed in is less important.
And Google PR isn't an issue with the ODP and the guidelines. The ODP has been around about as long as Google. The ODP isn't the tail that Google wiggles. Don't hold your breath waiting for the ODP to change how it does things based on Google. Google is free to ignore ODP editor profiles at their discretion. As an ODP editor I can't even get rid of my profile page. If Google pays attention to it, that is an internal Google matter.