Stoker would be very effective at choke points, more effective than any other fire support class. He can deny access to tight passageways, unlike Skyhammer, Arty, or Kira.
There’s places in every map with access to the skyline, which would make supply drops be less of a problem to use than the typical death from the sky schematic that is seen with the fire support mercs.
Supply drops don’t need to be just one ammo pack every time. I’d expect those things to provide for more than one person, like spam 4 ammo packs per run.