His suspicion is not a baseless suspicion. After all, Crystal Hoard got one, and so did they. If they are wrong about anything, it will be that Smite's reward has nothing to do with his motives. But they are certain that Smite should have received a unique reward.
The other things they are uncertain about are if they can get Smite's reward if they kill him and if they can kill him at all.
Legion-1 thought to himself, "If he has the smallest unit of the fire domain, he will have a world power of 100,000. If he has more, then he will be able to hit harder. But only that."
"The divine fire body doesn't enhance Endurance or Speed, so no matter how many units of the fire domain he has, he will remain vulnerable. It is just that his attack power will be very high, which will make it dangerous to fight him."