I would go with Floyd and Smith for week 1, knowing that moving forward you have some studs that are going to get in.
Wallace needs to get back into football shape, I don't care what any player says, they are NEVER in football shape with then return from a holdout. Don't forget he is learning a new playbook, and although its not quantum physics, there is an adjustment. He has the potential to break loose for one long play, but more often then not if he’s running deep routes to clear out the underneath for Antonio Brown.
Austin is also banged up and may not even be 100%. I know with Witten out, he is going to see looks IF he plays an entire game. I don't like to take chances unless the coach says a player is 100% AND has no restrictions