It probably would make sense for Mike to get the Imp. They teased us by mentioning Jakeem and we saw Cindy's friend, Jenny Williams, possibly Jakeem's sister? But those might be red herrings. It would give Mike something to do.
I don't really remember Brainwave's powers from the comics. Jr. could read minds and he was also responsible for wiping Guru's memories of Earth-2 after the Crisis so she wouldn't miss her parents, I think. But I don't remember any TK.
Think have little brother able to use most powerful being on their earth would be something, and brainwave looks like most dangerous and powerful member of their gang!