Loro Parque Orcas lost weight from 2016 to 2022
A new study came out from 2022 involving Keto, Tekoa, Morgan, Adan, and Kohanah. This study involved the weight of the animals, where Keto, Morgan, and Kohanah (grown whales) all lost weight from 200 to 500 lbs (info from the study and Killer Whale Wiki). The only whales to not lose weight were Adán, who at the time was just starting to hit growth spurts, and Tekoa, who is unfortunately well known for always being underweight (he gained 600 lbs).
Link to study: https://linkinghub.elsevier.com/retrieve/pii/S1095643326000280
Overall, the study was very interesting, especially considering what it was discussing and the birth of Teno a while later (Study ended 2023).