Okay, first, info dump :
comparing our version to the JP wiki, we're short on a lot of bosses from the number of quest we have.
Because of that, some boss stay way longer that they do on the JP version
According to some people (haven't really verified that, through), some bosses spawn later than they do in the JP version (mostly tsarist)
So, in short, our actuall boss spawn list is not acurate to the actual state of the game. That's a know fact, and, form my point of view, instead of correcting this, we're letting things slide for that reason : "On the Japanese game, Dark Giant, Glimmers, Emperor Idoneus, Pandeons and Black/Golden Dragon Mega Bosses are removed once you reach quest 33. At this day though, Nutaku didn't removed these Mega Bosses, they are still present on quest 33 and further, but know that they may be removed when Nutaku finally add all the next bosses."
So, now, there is 2 available cases :
Nutaku will "correct" the mega boss spawn so they are close to the JP version when new bosses will come out, or
Nutaku will simply add more bosses, with different spawn than the JP version.
From what I have seen, nutaku changed multiple things from the JP version, but when the reason of the change where removed, they have kept the change they made. One exemple : since the angel where loli, and where cut off our version at first, the emperor droped other card instead. Now the angel are in our version, they still drop the other card, and the angels too.
So, in my opinion, I really think nutaku will keep the edits they made, and that our mega boss list is kind of "definitive". Instead of waiting for them to eventually "correct" the drop list, and letting wrong information on the wiki, I think it will be better to simply said "hey folks, our mega boss spawn range are inacurate, we need to correct this, please send us data about where you've seen each mega bosses". Fellow editors, what's your opinion about that ?