I like Mick Rogers but he isn't likely to ever make the podium at the TdF, much less win it. There are too many other guys that are better than him. He can climb okay, but he has never shown in the lead group in the finals of Tour mountain stages. Also, despite being a three time time trial World Champ, he has never done well in a TdF time trial. This might show that he doesn't have the capacity to maintain his power output after many consecutive days of racing. All in all, he doesn't have the means to contend for the gc in the Tour.
Furthermore, factor in that Bob Stapleton, when asked about 2010 and Columbia's gc prospects, talked at length about Konstantin Siutsou. Siutsou has finished in the top 20 in three weeks tours when working as a domestique for Columbia's gc hopes. Stapleton thought it was going to be illuminating to see how Siutsou performed when given leadership. He made no mention of Rogers.