IRVING, Texas—The Dallas Cowboys showed off their defense in the opener, strutted their stuff on offense in the second game and won the third with a nice combination.

Being 3-0 puts them among the league’s few unbeaten teams.

The lack of weaknesses they’ve shown so far might keep them around the top for quite awhile.

“We’re slowly starting to jell and that’s huge as we get farther along in the season,” defensive tackle Tank Johnson said Monday. “That’s what the regular season is for, jelling for the postseason.”

Sure, it’s only September, but...

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