The Denver Broncos currently have one of the best defenses in the NFL, but it's not a guarantee it'll stay that way. The way for this team to continue winning at a high level is to not only address roster needs, but to also bolster strengths.
There are mock drafts out in the NFL world that have the Broncos using their first-round pick on defense, and it's a logical move for this team to make even with the urgent needs on offense. Denver obviously has more than just their first-round pick, so things could work out in the end.