Agreed, if keeping Stamkos while still being able to improve the team with maximum capability is the goal, then trading Sergachev from a positional area of strength is the right move. He also likely provides the best return in terms of picks and/or ready prospects, and his trade, in addition to Jeannot and Sheary being traded(or perhaps bought out in case of Sheary if necessary), provides the team with more than enough to keep Stamkos, still add another decent F, and add another depth dman. This is all in adfitionnto filling the other roster spots and replenishing the cupboard some. It won't happen most likely, as will neither the much less beneficial hypothetical Cirelli or Cernak trades, but moving Serg does seem to be the best move for short term success.