Flamethrower verse Gaviota

He meant replace as in he put the skill over his grenade button.

But Yes:
Burst fire is a "boost" to Double Shot.
Wraith of the octopi is a "boost" to Octopus.
You can still summon gaviota and air strike separately.

Nono, I mean, with Air Strike's massive hit radius, I wouldn't ever need to use Grenade to hit far away monsters again.

Oh wait, actually, it doesn't hit that far down, does it? Never mind.