First, I'm not disagreeing with you Neil. I think we definitely need more difference makers, or Alphas as you say. I just found it interesting that you dismissed the argument for 5*s and listed mostly 5* or close to it players as the type of player that is needed.
I get it that you don't necessarily care what star rating the player has. On a player by player evaluation neither do I, as there are plenty of examples of players playing above or below their rating. But the truth is, a greater % of 5*s turn into difference makers than other rated players. Get the 5*s and increase the chances of getting the alphas.