What determines the length of this fight is what work Kelly wants to get in and Sigmon's toughness. Jaco went out earlier than expected. If Sigmon comes out wild throwing haymakers Kelly could decide to just put an end to it. Overall, I expect him to keep working with the left and see how far that gets him without getting too serious with the right. My guess is this is still all about working with the left and getting used to using it even more than just a jab. Start getting people/opponents worried about the left to take attention away from the right.