I am sure on one of the Gears games their is an achievement for doing 1-50 horde without a player going DBNO lol.
Revive is good for when your not near your team with Hijack and things have got bad and there all down, if you run over and hijack ends, there all up. This was also mentioned on the stream so people could have more fun with Jack without having to worry that the team will be affected if he is not around to heal them. Could be the answer between DNF and Victory 

