It was vague suspicions at this point. There were seven heirs to roof of the world, his collages felt he was capable of anything, and this person was at lest in the area when a body was found with a seven etched on their chest, the exact number of heirs. Considerations for the general attitude of superiority, it would be within the wheel house of the first heir to function that way.
Conjecture but possible, the greatest reason for this to be false was that a steward heir wouldn't need to conceal his presence from in the locales. While not as potent as stewards, they were well above the average human. They also could tell people clouds were made of chocolate and they would start a cloud harvesting business to get said sweet stuff.
"Would he be the kind of person to do something like etch a seven into someone's body?"
Playing nonchalant as to not arouse suspicion, the huge sigh and eye roll that Second issued worried the heir Dyne.