Nina(Croatia 2015) was one of the few who opted to skip rehearsal for the grand final... Understandably though it may be to reduce the pressure and stress given how the rehearsals are now filmed as well, skipping for her didn't do any good
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This brings on to a potential topic of debate;
This year, the rehearsals will be filmed as well. I for one would have vastly preferred that the rehearsals are not filmed, for the element of surprise, and for the artists and team's freedom to experiment in peace. If you can't experiment on the stage due to the pressures of public perception, what's the major point of rehearsals(apart from testing live vocals,stage and sound)? Unless they are filming the best version of rehearsal, this action of filming rehearsals can only hurt or confirm anticipation.
In the case of Salvador during rehearsals, it is not the voice I will be curious about. It will be in the concept of the staging, volume of the microphone and his potential dressing. I guess my imagination runs wild. I can't help but imagine potential stage sequences, perhaps of Salvador singing from a roped moon stage piece, or Salvador sitting in a cafe or park setting, singing to and holding a teddy bear.