I don't necessarily think that Andras views Rowan as an Inferior necessarily. I have the feeling that initially Andras did not trust Rowan, and thus he acted arrogantly and 'show-offy'. I may be speaking solely of myself... But I've been down that route myself towards people I didn't trust. Is that dickish? Probably.
However, once you have been successful in accomplishing some of the missions, Andras seems to open up a bit more towards Rowan, to the point that I think Andras will eventually become more respectful towards Rowan in the future. What makes me say this? What Andras says at Raeve Keep.
"I must say that you've really impressed me on this day. Your grasp of strategy and my might took this place far more easily than I thought we would. Lots of prisoners and loot to bring back home after this. The results speak for themselves."
Immediately after this, Andras then offers Rowan an apology. Here is the quote from the game. "I... apologize for arguing against your plan before, that was foolishness."
And evidently, this came as a surprise to Rowan himself. "That was very surprising coming from the ever arrogant Andras! Rowan looked at his master and found him smiling in-spite of his self admonishment."
This to me, was a fairly provoking moment in the game and it certainly made me rethink his character when I first saw it over a year ago. That doesn't necessarily mean I'm going to join the Griffith, I mean the "Andras did Nothing wrong!" crowd, nor is it going to stop me from stabbing him in the back if possible in the future, but this scene made Andras feel more... well, human. In a way that I haven't really felt from Jezera.
As to his Impulsive behavior and relative 'murder-hoboness' towards his own Orcish troops... Yeah, that's another issue entirely. And It is possible that these could be curbed in time, or alleviated.
Edit: Changed colour of the Quotes to make them more visible.
Well, there are a lot of theories regarding Andras's behavior that fit the data we've seen thus far, ranging from the plausible ("You're a hero that killed our father and would like to kill us if we didn't have a hostage; of
course you'll try to betray us") to the stupid ("I have a massive crush on you, and this is my way of pulling on your pigtails"). Your explanation makes sense as well, but I think we'll have to wait for a change in their relationship one way or the other to reveal the core of the rift between them. It could be as simple as Andras viewing Rowan as an enemy they're forced to work with, after all; if the tables were reversed and Rowan was the one forced to employ Andras against more dangerous demons, would he necessarily treat Andras any better?
I was more concerned about discussing the
result of Andras's behavior - that until he gives the player a reason to think otherwise, the player's going to view him as a jerk that they want to see something bad happen to.
Though while we're on the topic, my personal theory is that Andras is more insecure than his arrogant demeanor would suggest, and he hates having to rely on Rowan to do something he believes he
should be able to do himself - I think this shows through more in the passages where Rowan favors solutions Andras would have pursued. If Rowan takes Raeve Keep by force instead of by guile, Andras is notably warmer towards Rowan, and is a bit peeved if Rowan instead uses spies; in my opinion, this is motivated on at least some level by the fact that, given time, Andras knows that he could have offered a military solution of his own, while he knows that he's not the kind of person who could have effectively facilitated Jezera's solution. When Rowan agrees to Andras's solutions, he's being a useful tool for Andras's vision at best, and a mentor at worst - it doesn't threaten his self-worth, because the results are something that would have just been a matter of time. When Rowan pursues Jezera's solutions, though, it risks making Andras obsolete as a leader - because he's all about force aggressively applied, and if that won't work, than where does that leave him? A general without an open war? A footsoldier sent to end conflicts that are over before they began? He already has reason to fear, given the failure of his father and the fact that secrecy is the only thing protecting them now, against his own instincts. Every time Rowan decides in favor of his sister is just another fact confirming the truth behind those fears.
...At least, in my own reading. Motivated reasoning is a powerful drug, though; if one starts from the premise that "There's a deeper reason behind Andras lashing out", then it's easy to find an explanation that fits the facts, especially when we have different scenarios to compare his reactions to. That doesn't make it
true, though; he could just as easily have grown up with far too much power, and learned to view every problem as a nail to be cowed into submission.