I think POS would make sense in that he does have a very high skill level which they don't seem to have in any of their current wingers (with all due respect to Guerin, Kunitz and Fedotenko, Patty trumps them in the skill department). Would look good riding shotgun to Malkin. That being said, Shero is usually very careful with cap considerations and POS's 2.9 hit probably isn't overly appealing. That makes me think Comrie or Pisani.
If it is any of those 3, I'd think the expected return would be:
The Oilers would have to take back salary if they trade Patty to the Pens....since Pittsburgh doesn't have the cap space to just give up a pick. Can't really see it happening, not that it's impossible either. [And I don't know why everyone is so anxious to get rid of O'Sullivan anyway, but whatever....]