For Evenepoel an ITT would have been much better than a rainy TTT. Now it will probably be between him and the three leaders of UAE: Almeida, Vine and McNulty. The latter two were beaten by Van Eetveld in the UAE Tour. Almeida is just starting his season.
Eighteen seconds isn't that much to make up for Evenepoel, but the course isn't very tough and UAE has the team to control the race. Bonus seconds won't be enough, so he'll have to attack. Maybe the decision will only come in the final stage.
Rogla won't give up easily. I see him attacking the rest much earlier, maybe even today 20-30 km from the line. Evenepoel has to react then.