NBCUniversal's choice of Telemundo newscaster Jose Diaz-Balart as a fill-in for MSNBC anchor Contessa Brewer this week reflects a shift toward "more cross-pollination" among NBCU-owned networks, the company's Lauren Zalaznick says. "We're looking to garner audience all over the NBCU portfolio. ... There's a drive to serve audiences that we have in common. And it serves our ad-sales customers."