Oo, very good question.<br/><br/>That comment was straight from Jane's ruthless side. The way she sees it- these people now know you, and if law enforcement picks up any of them for questioning they'll be able to comb their memories for a description of Antimony and Hachi. If that happens, law enforcement will be looking for Hachi and Antimony, and Jane will have to kill them if they interfere. Jane doesn't want to kill innocents if at all possible. If she has to kill a few cartel weapon smugglers to ensure that, it's an acceptable loss by her standards.<br/><br/>It also lessens the chance that hachi and Antimony will have to ditch their morphs after the mission. Jane, of course, equates switching morphs to the pair /actually dying/, so it has a larger priority for her.<br/><br/>So, it's not necessary as much as it is an efficient way to cover up their involvement.