The gaps list's existence is a terrible idea, and suggesting gap values between tiers on the list when adding a new pet is kind of pointless when the list has a few small but major flaws. For example, according to our rarity count data, blue and green toxic are worth the same, and yellow and red toxic are worth the same rarity-wise (demand-wise I can't see these pets being that different either as they are all littermates). So debating whether the gap is a red toxic when it's placed above the rarer green toxic on the list is kind of pointless imo. If you want to discuss the UR Peach's position on the current rares list, let's just discuss a tier to place it at and not worry about gaps? It's not like most traders will have the exact gap pet anyway. The list is supposed to be a guide, not a rulebook.
Count numbers from August:
Purple Toxic 153
Green Toxic 191
Blue Toxic 192
Yellow Toxic 230
Red Toxic 232