The Best Arguments for and Against D B Cooper's Survival?

There are sky diving services that let you recreate the d b cooper jump just for fun. In private sky diving services, they actually have bowing seven 20 sevens with the aft staircase. So it's not as dangerous as some make sound. What do you think the best arguments are for and against him having survived? I think the best argument against him surviving is that they never found anybody spending any of the money he stole.