I think Pens & Wild don't match well as tradepartners as long as the centerpiece of a potential Rossi trade would be Rakell. Simply because of age, positional value and timetable both teams are in.
A similar counteroffer from Minnesotas side would probably be a deal including Zuccharello or Brodin or Spurgeon and a pick/prospect for Rakell. This is just an example for you Pens fans that the centerpiece of a trade needs to fit, regardless of pick/prospect as sweetener.
Rakell for Rossi does not work, imo.