Remmy20

I actually thought Jaime was mostly right. Jon was talking about joining the Night's Watch with stars in his eyes and Jaime knew it wasn't going to be as glorious as Jon thought it would be from his own experience with the Kingsguard. I believe Jaime was certainly wrong about some things like you mentioned, but his overall point was correct or else Jon wouldn't have bailed like he did. The revelation that Jon is Rhaegar's kid could be interesting for Jaime, though. I don't know if that is quite true. There's a line in A Storm of Swords that would appear to hint at some regret/remorse to me.

As far as the books are concerned, I would say you are correct about Kevan. Though it is difficult to say how much it relates to the show considering things play out a bit differently compared to the books.

I wouldn't be surprised if the answer is pretty simple. They just wrote his character into a corner where the only other option was to essentially write him out of the story without some (contrived) subplot to bring him back into it later. They have just tried to make the best out of the situation and I have to say it hasn't worked.

While Wally was my favorite, I don't see why they would given that he was essentially inconsequential to the overall story during the two seasons we got. His entire purpose appeared to be a plot device for Artemis (and, to a lesser extent, Dick and Bart), and when he took her as far as he could, he got both fates (written out/killed) that most plot device character usually end up getting. Honestly, the show's lackluster handling of the events leading up to his death is why I'm not all that excited by the news about season three at the moment. I had no problem with him dying, but it felt like the was nothing of substance or worth behind it because of the way they handled everything leading up to it. As for the team in general, I assume the roster is going to continue to be as big, if not bigger, than it was in season two. Hopefully they're able to handle the large cast better this time around if that turns out to be the case.