Pixelation is for helping people with their art. Edits are a powerful tool to do this. If someone takes an edit as is and posts it on PJ without mentioning it's been edited and who did the editing, that falls under art ripping and PJ should deal with it according to their rules and restrictions. It's not Pixelation's job to do PJ's job.
It's not good for the picture itself as you say to have it 'fixed' by someone and then take their edit and pretend its yours. If this happens, it's wrong and it doesn't help anybody.
If you look at an edit, see what you did wrong and fix that, that's perfectly fine in my opinion and exactly what this forum is about. If the other people on PJ also need critique, this is an open forum. It's not Pixelation's care if the people over at PJ edit art or give good critique (or if the don't give useful edits or critique, more to the point), nor do we have to legislate, so to say, around that.
Pixelation challenges have always been about incentive. A reason to do more art and get better. Communal spirit to push along, not about being omg #1. This is the sort of shit that killed the demoscene, and we're not about to encourage it, from a moderator standpoint. Officially, Pixelation does not care who wins competitions and what assets they utilize to do this over in PJ. Take it over with them if you want something to change. We are not affiliated directly to synchronise organisation. This is an open forum for help with pixel art and if that gives an edge to someone in winning an internet art competition then fine, just as long as he's not stealing anything.
'noobs' <- nobody here is considered a noob. Such attitude is not encouraged, we're all here to learn and help others.
'someone who knows their shit' <- nobody here is master pimp of pixel art, we're all learning. I don't like it either when people come here just to showcase and get ass-pats and don't care for critique that people post, but what can you do.
My suggestion is to limit PJ challenge threads here to just verbal comments and suggestions, or NPA interventions and examples that can't be used as part of the entry.
I don't think this is a good idea. PJ is PJ and Pixelation is Pixelation.