I don't find Gale very suspicious either. He seems to be very honest about everything so far. I can see his story taking a darker turn, when Mystra gets involved ( and she most certainly will be) and you make the wrong decision. But I don't think, he is evil atm. or suspicious in any way. He is certainly one of the more easygoing companions for me. He and Shadowheart are the comps, I get approval easily by just playing how I like. Given that all companions are basically Mary Sues, who are oh so special, I can totally see the Elminster route for Gale. I wouldn't care for it, but I wouldn't put it past Larian.
About the Dragon Age comparison: There are no real similarities between Gale and Solas apart from the fact, that they are mages. Gale is open minded and friendly, while Solas is borderline racist ( try talking to him as a dwarf or Qunari). Also Solas betrayal isn't really a surprise, If you played the first two games: in every game, you are played by your mage companions- Morrigan in DAO, Anders (and bloodmage Merrill to an extent) in DA2 , so yeah, I was eying Solas, Dorian and Vivienne very suspicious.
"We are all stories in the end. Just make it a good one."
