Jordan Lucas is a restricted free agent at a time when unrestricted free agency is going wild. That means the Kansas City Chiefs needed to decide at what level to tender him, and the decision has been made at the sixth round level.
By offering Lucas a 6th round tender, it means that the Chiefs safety is free to try to sign with another team but the team has a right to match any offer he receives. If the Chiefs give him up to that team and refuse to match any deal, the signing team must compensate the Chiefs with a sixth-round pick.