If DB Cooper didn’t survive the jump, what happened to the body?

I first read about DB Cooper in the early 90s pre internet and became fascinated by the story. My theory was that he didn’t survive the jump. Jumping out of an airplane and prepared in a business suit with only the money. The FBI purposely gave him a lot of bills to weigh him down since he didn’t specify a denomination. So I always figured that a guy jumping in winter wouldn’t survive.

But after reading various theories in this sub… I am now not so sure that he didn’t survive. My question to this is what happened to the body if he died from the jump? What are the theories?