Legendary Collection was specifically designed by WotC to support sealed play, thus it had a gimmick where it's commons and uncommons did not follow the typical ordering, but instead had a fixed cycle which each pack took a 9 card slice from. The order is designed such that most stage 1's were flanked by thier prevolutions and types were often placed adjacent to allow for coherent decks to form. The full (looping) order can be seen in the same source git wiki used for the pull rate data https://github.com/Pepper0ni/TTS-PTCG-Pack-Simulator/wiki/Legendary-Collection-Information .
None of this is reflected in the pack simulator, which is especially unfortunate given the sealed play focus of this set.
