A new trainer and a new weight class seem to be a bigger challenge for Daniel Jacobs, as he makes his super middleweight debut on December 20th against Julio Cesar Chavez Jr. While Chavez Jr’s status is a huge issue, Jacobs is only focused on getting back in the ring after his May loss to Canelo Alvarez at middleweight. “I’m training for a challenge, but if you want for me to be completely…