Is Palmieri going to push down one of Pasta, Bergeron or Marchand from the first PP unit? If not than to pay a hefty price for a PP specialist only to use him for 35 to 40 seconds on PP is not a smart move.
Palmieri is heavily relying on his shot as the major asset. Scores a buttload of goals on PP, not denying that, however on ES he is not that special.
If I were Sweeney I would call the Devils, ask for Palmieri and settle for Coleman. Coleman has scored the equal number of goals as Palmieri this season. All of his goals were on ES or SH. Also he is a much better 2 way player who is versatile at both wings or at a center.