i think the way we need to approach this summer, and every summer after it, is to look at our first team squad, figure out where the waste is, and upgrade it to the best of our ability. we can essentially replace both arteta and flamini with ki. those two were fringe players this season, for varying reasons, and neither has any upside left at all. if you can replace two players with one, and that one is better than both players you replaced, and you did it for a good price, that is smart squad construction.
we should be trying to sign the likes of vidal and pogba but they'd come in to be automatic starters. you still need a big squad and quality depth. ki seems like he'd be a quality depth player.