We can't read too much into what the public vote could be.
The only thing we know for 100%, is that Chris and Laila recieved more public support than Ricky. We also know Laila got more public support than Natalie.
Laila because she got one less on the judges leaderboard so therefore needed to get more than Ricky from the public to overtake him.
We also know for Chris because he received one more point from the judges than Ricky, and therefore if Ricky got more from the public than Chris he would have overtaken him on the combined. As he did not, we know Chris got more public support. This is the same formula for which we know Laila got more public votes than Natalie.
As for Ali, Natalie and Ricky, we really can't read all that much into it, except Ricky couldn't be higher than 3rd. Ali could have been bottom with the public, Ricky could have, or Natalie could have.