You say you strongly disagree but just look at what you're saying, Sten, someone literally born into a warrior society given only one role (to be a soldier) loses 7 times out of 3 to a girl whose primary strength is espionage. Where is it said that he is slow and straight forward? This guy is seen in the eyes of the QUnari (the prime military machine of thedas) as being superior to all others in his field, that implies that he can deal with a single rouge in which he has far more years of experience than. "Sten never see's it coming"...Asala disagrees with that notion. Leliana isnt renown for her ability to go toe to toe and a bow alone will not win her this fight. The best Leliana can hope for is using her bow and as i said before, that advantage only lasts as long as it takes him to get from Point A to Point B,
You've assumed she doesnt have any crystals that would negate that brittling effect, a flame crystal will fix that problem easily, Morrigan does have a chance i will admit but ice spells wouldve been the best weapon without those crystals, all it takes for Shale is to get one hand on her and its over. Much more than the 9:1 ratio you're trying to say. Now that i think of it, with frost out of the way, what spell would effect her? Thats really the only weapon she had, and its negated by flame crystals
Sten has shown to be impatient. As much as I enjoy his character, he isn't as cunning or perceptive as other fighters we've encountered. We know Leliana isn't just talented in espionage...she stood side by side with the warden battling darkspawn (and others) for a year. She has a varied fighting style, and is very adaptive. I'm not saying it's a definite victory, but the only time(s) I ever seen Sten winning is when he either gets her with a really powerful well placed blow from Asala, or successfully dodgers her "one-two hit" and retaliates (which mind you, isn't very likely/often). I can see Leliana winning in several ways. So I feel my 7:3 victory is justified, Leliana does have an edge in my opinion. If this battle was against Alistair, Loghain, or Aveline...that'd be a different story. It does not matter that he is the Arishok, as honorable it is, it's just a title. And titles don't win battles (as the previous Arishok can tell you).
As for Shale, if there's one thing we learned from playing role-playing games, especially Dragon Age, it's that resistances can be negated through debuffing. Morrigan excels in entropic magic, and can negate any magical (and physical) resistance Shale has from these crystals she may or may not have. Also, it's not as if Shale resists the brittling effect from being resistant to cold damage. She'll take less damage from cold spells, but she won't resist the brittling/freezing effect. This is proven in DA:O and DA:2, where enemies who are immune to cold damage can still be frozen/brittled from winter's grasp/cone of cold. As for what other spells can be effective besides cold against Shale; any one of them could. Once Shale is debuffed and brittled, any of the magics could obliterate her- fire, lightening, spirit, nature, whichever. She'll be total weak to withstand it.
You seem to understand where I'm coming from with my decisions. Indeed I am assuming on things, but isn't that the rules of the game? At least I provide logical/fair explanations for all my choices. This is, after all, up to creative interpretations. Though I do admit, some choices are easier to make/justify than others.