There is just a lot of sensitivity that has developed around using one (or more) of the aggregator sites as being a complete and accurate collection of ALL of the validated (as they have been over time starting from 10/28/17 to the present) Q posts, and NO other posts; so that the general population can feel comfortable in relying on a given aggregator site (to read Q posts).
It seemed that a pretty high degree of confidence had developed around the use of https://qcodefag.github.io/ for that purpose. Let's hope that the new http://qanonposts.com/ will be proven to perform equally as reliably.
As far as I know, the same person set up both aggregator sites. And from my observation, the sites (single webpage in each case) are automated. Shortly after a post appears on qresaerch or greatawakening, it and context (if any) appear at the aggregator - no matter the time of day or night. The context appears to be a mechanical taking of referred post, and no more, so sometimes the context is lost due to limited lookback.