On Icardi, I dont know, I made the Iaquinta reference for this reason only, he didnt play, wasnt part of the team, still getting paid, etc. You said Conte never played Iaquinta so I thought you meant that despite not playing Iaquinta he will play Icardi...
On Sanchez, I hesitated between a Krasic and an Eljero Elia, but decided on the serb as he was actually good once, of course cannot compare with Sanchez good level two years and more ago. And yeah, if somehow this old Sanchez returns, merda will look scary in attack. But I doubt it, since its merda we're talking about, they are like Italy's Man Utd or Utd are like English Inter, once they get a player he is bound to perform worse than before in his previous team..
In short, I dont believe that Sanchez will do more good than harm for the team, but I could be wrong and Conte could actually make him a solid soldier and a heavy weapon. We'll see..