Since both of these stories are outdoor survival stories and both men have to survive alone using only their skill and wit, that seems to suggest a good thesis. Surviving a hostile environment is impossible without skills, confidence, problem solving abilities, and the acceptance of advice from seasoned veterans. I believe that could be a good thesis. Both men were given good advice from experienced people, but the Alaskan green horn did not follow it. Rainsford accepted advice from a survivor who ends up working for the General. Both had some outdoor skills. Perhaps the over confidence of the green horn is what killed him along with his failure to notice warning signs from nature.