These are assumptions we can't make and, as you pointed out, Arsenal have this bad habit of not capitalising on the good fortune that comes their way.
I think the team needs a makeover. Are there any big signings on the horizon? Or will it stay pretty much the same as last season?
Perhaps Arsenal will be a little different this season because they should have learned a lot from the previous two seasons, where they always made mistakes when they had opportunities to capitalize on. So this season they should be able to make changes in terms of capitalizing on the moments and opportunities that arise, because that's how they can become the best in the Premier League. But if Arsenal continue to play like last season, it seems Arsenal need more overhaul, including their current manager and most of their current players.