The problem with this is if Koeman really is just a coach, his job must be under considerably more scrutiny than most people are suggesting, because at the moment we don't look like we're being coached at all.
If he gets a chunk of credit for bringing in Pickford, Keane, Gana etc then he's earning his keep, if we're saying he doesn't then it's extremely difficult to see exactly what we're paying him for. Rather than improve any of the players that were already here through his coaching, he's effectively just asked someone to go out and replace them all with supposedly better players. Then he's put them all out on the pitch with instructions which currently appear to be something along the lines of 'go and have a run lads, if the ball comes near you, kick it'.