Yeah, I noticed that too. He was a big presence in the first half, so I wonder if it's intentional. Make him the main character in the first half, switch to Artemis in the second? Build her up before Wally comes back, I'm guessing.
I don't know, I still think the show has way too many characters. I don't know about anyone else, but I got into it in the first season because of the core group of characters that I grew to love- Dick, Wally, Conner, Mgann, Kalder and Artemis. Them individually and as a team.
As soon as Season 2 started bringing in all these other people who kept coming in and out it was just really hard to care about any of them. I wish the focus could be on the same characters from the first season they spent so much time establishing.