OverviewIt might be the deepest group of tight ends scouts have seen in a while. Notre Dame’s Tyler Eifert leads the way as a possible top-20 pick, and Stanford’s Zach Ertz shouldn’t have to wait long after that. There are several good second- and third-round prospects, including San Diego State’s Gavin Escobar.Cowboys’ needsJason Witten, who turns 31 next month, remains at the top of his game. He got off to a slow start in 2012 after a spleen injury in the preseason, but he still set an NFL record for tight ends with 110 catches. For the second consecutive off-season, though, the Cowboys are searching for a backup tight end. Martellus Bennett departed as a free agent a year ago, and John Phillips followed in free agency this spring. Dallas drafted James Hanna in the sixth round last year, and Hanna played in 107 plays to 333 for Phillips. But in the final four games, Hanna’s playing time increased. He played 52 plays in the last four games, while Phillips played 55. Still, the Cowboys need a third tight end.Top five Tyler Eifert, Notre Dame, 6-6, 250, 4.65: He set school records for a TE with 140 career catches for 1,840 yards. Zach Ertz, Stanford, 6-5, 249, 4.68: He could be a first-rounder after making 69 catches for 898 yards and six TDs last season. Gavin Escobar, San Diego State, 6-6, 254, 4.78: He finished his career with 121 catches for 1,622 yards and 17 TDs. Vance McDonald, Rice, 6-4, 267, 4.60: He had 120 career receptions for 1,513 yards and 15 TDs. Travis Kelce, Cincinnati, 6-5, 255, 4.68: He had 45 catches for 722 yards and eight TDs last season.Sleeper T.J. Knowles, Sacramento State, 6-8, 258, 4.76: He could be a late-round pick after catching 38 passes for 381 yards and five TDs last season.Source: Heights, weights and 40 times were compiled from NFL Draft Scout.