Rookie Mitch Trubisky’s Tuesday plans wouldn’t work. As offensive coordinator Dowell Loggains explained, the “this, this and this” of Trubisky’s schedule required reorganization. “These [rookies] don’t know what they don’t know,” Loggains said. “They’ve never done it. This isn’t Chapel Hill. This is the Chicago Bears. This is big.” Trubisky turned to Mark Sanchez, the Bears’ veteran third-string quarterback who has been inactive every week this season. “Mark was like, ‘No, clear your schedule. This is what you’re doing: a massage, watch tape with your wideouts [and] you need to watch the blitz tape before the Wednesday morning meeting,’ ” Loggains said. “Mitchell is like a sponge. He just doesn’t know what he doesn’t know. “That kind of guidance and leadership not just coming from myself and [quarterbacks coach Dave] Ragone — that player-to-player accountability — is huge.” It’s one of the many examples of why Sanchez is considered a vital cog at Halas Hall. As a former top-five pick who was scrutinized in New York, Sanchez was signed in March weeks before the draft with the future in mind. He’s part of the team’s investment in Trubisky.