That's really not true. By far the most important job of the punt returner is to consistently catch the ball. Kirk can do that.
He did only average 6 yds per return, which is one of the worst avg's for a primary punt returner in the league - but the average is like 10. The total punt return touchdowns all year was 8 for the whole league - no Returner had more than one.
The way I look at is if you have a very good offense an additional 5 yards per punt is really not a big deal, and is not going to cost you scores very often at all.
I am pretty sure Moore will be used as the return man - they even mentioned it while they were drafting him.