You only have to look at their training to know how a decision will go. Carwin is training for a 1-2 round fight while Brock is training for a 5 round fight. Carwins training involves a lot of heavy weightlifting and olympic lifts. Brock is more focusing on muscular endurance and monster core strength.
Carwin wont last 5 rounds with Brock, but will Brock last 1-2 rounds with carwin? I think he can.