Actually both of them won't make for first place so 6* is out of question, but is not that hard to get them as 5* if any of them manage to get into the 3rd place atleast, and is better to have a Mint or Cepha as 5* than again the same characters repeated with the same number of stars like Baccara case looks like will be, still anyone is free to vote for whoever they want.
I think I was pretty clear on that though:
Keep in mind, these aren't official rules or anything. I personally made these up to benefit everyone so that we'd get the best possible results and so people wouldn't be confused. In other words, you can ignore them and do whatever you want. :P