I don't think the reference to Mac's father in 6.02 necessairily means he's getting another nemesis. His father was referenced in both Mrs Azrael and Yahrzeit which were episodes that had nothing to do with his having a nemesis. Could be it just comes up because of the particular case they're working on, or maybe he talks about his dad to Flack - about feeling powerless in a hospital, much like Flack must've felt in Pay Up. A Mac nemesis so soon after Dunbrook would be a little too soon. I don't mind Mac getting another nemesis as long as the whole team can be involved and the nemesis is interesting, but it would be great if the shooter turned out to be someone with a grudge against the whole team (the Irish guys from Snow Day would be a good example, unlikely given the time difference, but they'd be pissed at Mac, Flack, Stella and Hawkes, possibly Danny too) or the Tanglewood boys with a grudge against Danny. I'd personally love to see someone coming after Flack for some reason. Maybe the guy he shot had a brother or something, or some scumbag he put away gets out of jail. Rikki coming back or Kaye being a problem for DL would be brilliant. I'm kind of hoping Lindsay will decide to leave or at least cut her hours after the shooting, and Kaye will be coming in to replace her.