well Louis has already said his fourth choice to go through would have been four of diamonds (ofcourse we know he probably wanted them as third choice but producers forced through that Bratavio act), he also said in the series he did not want more than 1 'boyband' so he could focus on 5AM.
so it has to be 4 of diamonds, if not then its just more shitty manipulation, the main reason viewers are switching off!