You mean Cayso or Racnar getting corrupt?
Yes, best to go at your own pace. But the thing about part 3 is it can almost be treated, at least at first, like a separate rp, though some of the same events may be happening and somewhere you'll have to maybe steer things or make sure they both end at the same point so you can have part 4.
You sure you don't want to rp as Ducky? How about your human character?