@troubleMoney he has some hypermobile joints and based on that information, I'm 100% certain that the seat cushion is because he was having joint/muscle pain.
I'm hypermobile also and it gives me a big Sad when people mock the zucc for his hypermobility—you aren't doing it directly, but i have seen people post pics of him hyperextending his knees and then saying it makes him look less human.
the zucc needs to stop, but his #hypermobility isn't a thing to mock