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If it has been explicitly confirmed that it's an Alternate Continuity, then yes, the page should reflect that.
For the image, you should start an Image Pickin'
thread.
Right here is where Xiaolin Chronicles was designated as a standalone series. [1]
Furthermore, the special edition has a different origin story from that of Xiaolin Showdown here in its preface. [2]
As for the Image Pickin' threads, how many people need to approve of the change before its implemented?
A minimum of five people should approve before you change the image.
Gotcha, thank you.
I don't know how else to phrase this precisely, but since Xiaolin Chronicles has been established as a standalone reboot / alternate continuity rather than a full on sequel to Xiaolin Showdown, it makes sense to go back and tweak the page so it reflects that? Since a lot of tropes read as though it's sequel and would be redundant now, like the Series Continuity Error and Broad Strokes.
Also, since the Xiaolin Showdown has official promotional art on its page, would it make sense to swap out the screencap on Xiaolin Chronicles' page and replace it with similar art? Examples here
◊ and here
◊.