If Harley is actually going to go hang out with the Rogues she'll probably spend some time around Wally. They manage to get him to buy them drinks more often than he'd like to admit.
Helena! <3 I love that woman so much. She needs to team up with Wally to give Dick a hard time. Out of love, of course.
Pfft, everyone knows G'nort is the best Green Lantern, bro. Your info is so out of date. (I am ENTIRELY joking) Yes, yes they do. Barry, Ollie, and Hal are basically Wally's uncles either way.