The Cubs are the frontrunners for free agent right-hander Edwin Jackson, but as of last night they weren't the only team pursuing the Legacy Sports Group client. The Indians were still talking with Jackson yesterday, and it wasn’t long ago that the Rangers and Padres had serious interest, too. The bidding is up to $50MM for Jackson, who turned 29 in September. Here are the latest Jackson-related rumors, with the most recent updates up top…