Right now, I think the PK Fs are Backstrom, Beagle, Laich, and Oshie. I suspect Chimmer would be the 5th guy, and wouldn't be surprised at all if they coaches gave Wilson and Kuznetsov PK duties. I think we're ok right now in that department, but would absolutely love to add a solid 3C/PK/FO guy.
I think we add a bottom-sixer regardless just to add depth from a numbers standpoint, as there aren't many naturally bottom-sixers slated to be in Hershey. But at worst, the 3C issue could be addressed at the deadline, with a deep class of pending UFAs (that will certainly become shallower): Staal, Kopitar, Plekanec, Backes, Legwand, Nielsen, Sutter, Gaustad, Gordon, Ott, Helm, Kelly, Moore, Brodziak, etc.