6 teams have progressed to the fourth round. They are United Arab Emirates, Qatar, Iraq, Oman, Saudi Arabia and Indonesia. IMO, out of these six teams, the ones with brightest chances are Saudi Arabia and the UAE.
It seems like everyone underestimates Indonesia, no wonder because they can be said to be a weak team, even though they were able to be in their current position from the first round. Even though you said that the biggest chance belongs to Saudi Arabia & UAE, I would say it should belong to Indonesia. Miracles do happen, let's see how the fourth round end.