I have to say, I've been really disappointed by Sam and Bobby's appearances over in Avengers. I hope it's like Asquared said, and Hickman's just focusing on the new characters right now, and we'll get some development with them later.
Also, weirdly, why does Bobby always get drawn with a fiery power signature? He's called Sunspot for a reason. Because he has spots. Like on the sun. Sunspot.