Under Bill O’Brien, the Texans have a history of taking flyers on secondary players in the late rounds of the NFL Draft.
2018: Jermaine Kelly, 7th Round
2014: Andre Hal and Lonnie Ballentine, both in the 7th Round
The only year they did not do so was in 2015, and that was presumably because they selected Kevin Johnson with their first round pick. There is no such thing as having too many good defensive backs. They can contribute on special teams, and they make your team more flexible in coverage options.