Yea, the thing for Val and Silas. Genji is there as a fail safe to make sure they don't die while grinding.
Only downside is, they don't get any EXP for anything Genji kills, even if they were to invite him into the party cause he is way above their level. Of course if they deal damage to it then they get some EXP, depending upon how much damage they did to said creature before it died.