I would normally agree with yourself, Griezmann should be coming in to compete with if not take the place of Suarez. He's operating through the middle these days and can play off the shoulder of the last man as well as dropping deep. I actually think Messi & himself will make a good partnership.
What I can't understand though, is who will fill the left hand side if the rumours are true about Coutinho & Malcom both being up for sale. It makes me wonder if they are going to go with a similar setup to Barca of 5 to 10 year ago, & put one of Griezmann or Suarez wide left like they did with Henry & Villa.