This type of activity could lead to managers not allowing edited posts to count which IMO I think would be great. Is he cheating? Technically no, but other managers may not feel the same way. Depends on the rules for the most part.
I think this is too overkill. I edit a lot of my posts due to typos and because sometimes I think about something else and add it to the post (an extra phrase or two).
Probably a better idea to check the original post instead (i.e using ninjastic.space) and not allow posts that were clearly made to bypass the weekly cut time (and
even if they are < 200 characters, low quality etc).