The Cubs got a lot of mileage out of announcing a roster of analysts who will contribute in the booth and studio for Marquee. Despite the splash the names made, it’s not as though the guests with national gigs for MLB Network, ESPN and Fox — such as Chris Myers, Rick Sutcliffe, Doug Glanville, Ryan Dempster, Mark DeRosa, Carlos Pena and Dan Plesac — will be giving up their other jobs.