In this month's "Leaders & Bleeders," TBS gets an unexpected boost from the "Big Bang Theory," which propels it to the top of the cable rankings and gives "Conan" some juice. Also, networks move to capitalize on the rise in dual-screen, simultaneous viewing. But, the industry's struggles to find a widely accepted standard for cross-platform measurement looks to be a hindrance for a long time. And, broadcasters put up a front in opposing greater transparency.