if he always say "i just do what's expected of support" and keeps lowballing himself when he was in hero's party, then no doubt that those mf will not appreciate his deeds
I reckon the reward won't match the deed of annihilating a whole army of monsters. If it's a thing in this series' world, maybe they can collect resources from the monster corpses. At least those that weren't turned into ash.
with how active he is when support them then there is no way he just "sit around in the back" in Hero party.
specially when he think that is just basic of support class.