I was actually pretty upset at first too because the ink grenades are a big part of how I play that map, but after a couple rounds with the incendiaries I was okay with it. I actually might prefer the incendiaries now because it gives you the ability to completely block the other team from entering certain areas by creating a fire wall, whereas the ink is only concentrated in one area. I found it pretty useful for walling off the area coming up to the longshot/torque bow spawn and the one shot/mortar spawn.