Not scared.
Actually the rush D was decent all last year until the Rams debacle.
They allowed 3.8 yards per rush. 400 -1513. Could it be better, yes, but it was not all that bad either. they made stops when they needed to many times.
https://www.pro-football-reference.com/teams/dal/2018.htm
Barkely in his 2 games, 11-28, and the last game, meaningless to us without some of the D playing the entire game, 17-109.
Guice was injured so can't say anything about him, and Howard can be very good. But if we can contain Barkely, we can contain him.