Why else have a Red Skull figure in the CA2 toy line?
I think his presence is to actually just deliver a more accurate representation of Red Skull from the first film. While the first film's toy line figure is nice - it doesn't match how Red Skull was dressed at the climax of the film. The new figure fills that void nicely.
Coulson's memory wipe thing makes more sense now since I think he was a Hydra agent too.
I don't think so - at least I would like to believe that he wasn't a Hydra agent. What's making you think that he is a Hydra agent, the fact that Hand thought he was?
And I was incredibly surprised at some of the agents who turned. Sitwell? REALLY?!?! I thought that guy was great. Especially after his appearance in a couple of the Marvel shorts that were on the DVD extras.
I'm guessing you haven't seen CA2 yet. (or at least you hadn't seen it at the time you saw this week's episode of AoS)