Disagree. You only have to have watched our games to realise we've only played one or two good games of football since January. Gameweek 4 - 20 were CL quality. GW21 onwards we've been poor but scraped quite a few wins to get us 5th.
You don't, but then he'll cost you even more next year if you want him and don't pay for him now. And if you don't want him ultimately then you'll need to buy someone else. Swings and roundabouts. Not sure how ultra-high quality good he is anyway. Honeymoon period over and he's not been so productive lately. See how he is after he has a full season or so under his belt. But again, finances are irrelevant really. Arsenal and Spurs can both easily afford and sign players that could make us regularly CL-qualifying worthy. Let's see if it actually happens.