It seems like the allies' ability to redirect damage would make Stealth Device a good investment, e.g. on Howlrunner, Serissu, Soontir, Wedge, etc. If the wing leader evades/focuses and their buddies are absorbing shots, stealth device should last a while, thus shedding the average expected number of hits/crits your allies have to absorb by a little bit. Though with so many shots coming in, eventually a damage will force its way through. Or foes can focus on the wingmates instead, which they'll be inclined to do so anyway unless they desperately need to remove a force multiplier like Howlrunner or Serissu.
Would this be a worthwhile investment, or is it kinda just doomed to not matter much?