Do you want to win in submission wrestling contests? Having the guts isn't really enough. You have to be ready for anything that your adversary throws at you. You must think quickly as this is what will make you a winner or a loser. When you are knowledgeable in other fighting styles (e.g., Judo, Jui Jitsu, Sambo, Catch Wrestling, Shoot Wrestling), you've got significant edge over your competition in submission wrestling matches. However, you can't really be an expert in all the fighting styles so you must choose one you want to use as a fighting style.