There is absolutely no way to know this.
No, not 100%, but then again this whole "why did he call the timeout" discussion is hypothetical. Anyhow, regardless of whether Miami called a timeout or they spiked the ball. The kicker still had to make the same kick from the same distance. The only difference would have been whether the kick was attempted on 3rd or 4th down. There are no other variables that would lead me to believe that he would have made it if they stopped the clock on a ball spike vs Miami calling the timeout.