As the NFL world waits for Brett Favre to make up his mind, the folks in Minnesota are beginning to imagine what life with Favre would be like. It might not include Tarvaris Jackson. During a chat Thursday, Minneapolis Star-Tribune writer Judd Zulgad wrote that he wouldn’t be surprised if T-Jack was the odd man out in Minnesota if Favre joins the team. In Zulgad’s scenario, Sage Rosenfels would be the backup this season and potential starter in 2010, with John David Booty slotting behind him. (Maybe Sage will be reading PFT again by then.) On one hand, it’s hard to imagine Brad Childress letting go of Jackson, the quarterback he hand selected in his first draft with the franchise. Jackson also continues to have significant support within the Vikings locker room. On the other hand, Jackson is entering the final year of his rookie contract and, well, he’s Tarvaris Jackson. Rosenfels is under contract for three more years, and just received a $1.4 million signing bonus. He’s not going anywhere.