It could make a difference, but it might not..
Firstly, making everyone vote certain ppl allows them to think about them differently--and might encourage them to vote for the same ppl next week.
-would put stress on them and will be able to see how they handle it, might make them act different to what they would normally
-we will see who is the most popular outside..and relatively order of popularity
-cause suspicion, and uncomfortable environment/relationships, as they will know they might be in cool group--but they still at the bottom of the ladder in that particular group, hence they might think after the 3 regulars up for nominations leave--they'll be the ones leaving next