Did I do that? Sorry, I am not yet familia with the way things work here. I think I was trying to change some small things, but it didn't quite work, so I tried again and again. I didn't know that this would remove and repost the pages. Sorry for that, I will be more careful in the future.
Hey, I know that there was no chronological order in the Exotic Dragon Collections before, but I can assure you that there currently is one.
As for my way of finding out and confirming the information, I rooted my old phone and hacked the game on that device, for the sole purpose of helping out with the wiki.
I obtained the info by starting a new game and progressing in the collections by paying runes.
There weren't any duplicates until I obtained every possible Exotic Dragon. Once I released one of them and completed the collection for the duplicate dragon, the dragon that I released reappeared. After that I released every Exotic Dragon and completed the current collection for that random dragon, the one that came next, was exactly the one that is listed after the one the was just completed. I took notes and screenshots, while testing this multiple times and the outcome was the same every time.
As for the Exotic Whispering Death being the first one in the order, when I started the new game, it was the first that appeared in my collection. One thing to note with that first collection is, that the border of the collection was different than every other collection that followed, it was bright blue like with the Bewilderbeast Collections, but every collection after that had a purplish border around the dragon.
As for you obtaining Sweet Death, Shockjaw and Smothering Smokebreath before the Hackatoo, I am sure you completed the collections a couple of updates ago.
Also, the Collectibles needed for completing the respective Exotic Dragon Collections stay the same every time that dragon appears in the collection. I will add this info as well.
And by the way, I won't post information on this site that I haven't thoroughly checked myself, trust me. :)
If you look at the needed collectibles for the Exotic Whispering Death and the Exotic Scauldron, then the Exotic Scauldron should be the first in the order. yet the Exotic Whispering Death appears first for new players. I just checked this again, by creating a new guest account. But the thing with the border around the dragon is probably just a bug, as the Exotic Whispering Death now has a brown border, just like with the Defender Dragon Collection.
Just now, I also checked the Defender Collections and found that it differs from the Exotic Dragon Collection system quite a bit.
Once every Defender Dragon in the order was received, the Collections thereof will be totally random, even if you release a dragon that dragon will only reappear randomly at some point. Also, the second time a dragon appears, the collectibles will be the same as the first time, but the amount you need of each item is multiplied by 3 compared to the first time, all Collections of that dragon thereafter will need the same number as the second encounter.
Here is the Defender Groncicle, just as an example.
I also just found out, that now the first Dragon in the Defender Collection is the Defender Gronckle. The Defender Monstrous Nightmare didn't even appear for me yet, even though I already completed around 30 Defender Collections after the Defender Thunderpede.
I think the changes for the first dragon of the collections is so that you directly get a dragon that can be used in brawl.
I ended up buying my Battle Monstrous Nightmare because I didn't want to have to collect all of the Defender Dragons I had already acquired just to see if it would appear first in the next round.
I finished with the Defender Dragon collections about 6 month's ago.
The later on the chronological list was available in Special Events.
Feel free to change the order when you complete your Defender Collections.
This info was supplied to me about 18 months ago and probably has changed since then.
You are probably already aware of Ludia's antics. :)