I’m so glad that Plumper is back with his brother again! :D It made my day when I found out.
It would seem that Plumper is missing/deceased. There have been no sightings of him this summer yet but his brother Kaikash has been spotted a few times without him. He’s been traveling with Surf and the A42s. Hopefully there’s some explanation and he’s safe and healthy somewhere and will join his brother later on. That seems unlikely though :( Poor boy, you’ll be missed.