It’s time to start thinking about how the Cowboys get to 53. We still have over a month to go before the Dallas Cowboys start the regular season. But already there are some significant questions developing about who they will have on the roster for the opening game against the Tampa Bay Buccaneers. The first preseason game at the Denver Broncos is this Saturday, and performances in that and the subsequent two will add valuable data for these decisions. Here are some positions that will bear watching very closely. Kicker Yes, we start with the low hanging fruit. Frankly, it…