 
																				
                                                You forgot some stuff
There's a chance that they only just got there and they wouldn't know Ketal's exploits + they're hiding so probably didn't hear much of the news (I know this one is dumb because if you're hiding, all the more should be privy of the news). 
Plus Ketal is an outlier of a barbarian. Most of them are, in their words, dumb                                            
 
																				
                                                You forgot some stuff
There's a chance that they only just got there and they wouldn't know Ketal's exploits + they're hiding so probably didn't hear much of the news (I know this one is dumb because if you're hiding, all the more should be privy of the news). 
Plus Ketal is an outlier of a barbarian. Most of them are, in their words, dumb.                                            

 
		
Why would that old man request a different mercenary when he clearly heard that the only C-rank mercenary in that territory is Ketal? C-rank is actually considered pretty high. And besides, mercenary ranks aren’t determined purely by strength, they’re based on how many requests/jobs they’ve completed and how dangerous those jobs usually are.
Also, if the old man knew that Ketal is a Barbarian, shouldn’t he have logically concluded that Ketal is the most suitable one for this job? Barbarians are strong, and even though they’re stereotyped as a “stupid” race, Ketal still managed to reach C-rank, which already proves his competence.
The old man seems to be a bodyguard, and the woman is definitely a princess. So.... how can their reasoning skills be this bad....