Thanks for your explanation. While I would not be surprised, I still personally consider this speculation.For one if you noticed before the dances and dance off pairs were even "picked" Zendaya already had on her jive shoes. And Aly had on her Cha Cha dress. Ingo and Sean looked costumed for rhumba as well.
But also in the post show interviews several of the pros and celebs mentioned how they decided it in advance because most couples had certain dances they preferred and it worked out well because it was pretty much 2 of them wanted cha cha and two wanted jive and two wanted rhumba. Also a few of the pros and celebs tweeted about it after as well. Sharna tweeted aly and mark thanking them for picking them first because they wanted first pick to pick cha cha.
As for Vals comments I think he just did that for drama. He knew how the pairings were going to come down before hand and just used that as an opportunity to try to make himself and Zendaya look good since they would be going against a higher scoring couple than Aly and Mark. I really didn't like Val last season, but this season he hasn't bothered me too much--mainly because I believe he is happy he finally got a good partner. But he is definitely starting to rub me the wrong way again.