Mark Sanchez in, Jameill Showers out in Dallas

A day after prematurely announcing a deal with quarterback Mark Sanchez under circumstances that cried out tampering, the Cowboys have announced a deal with the 2009 No. 5 overall pick who had fallen to No. 3 in Denver before being cut. Sanchez instantly has been stalled as No. 3 in Dallas, with no No. 4.…