If Trey were to return, I suspect he would prevail. Ivy is a very quiet bird and from last year, not exceedingly agressive. Trey on the other hand will take your head off. Could they/might they fight, always a possibility, particularly since Ivy has been using some of those hormones of his this year. Of more interest is who would Princess support, Trey the mate she has been successful with her entire breeding career or Ivy who, from recent activity, is the father of this year's crop o'chicks.
And to use my favourite phrase at this time of the year, hurry up and wait, that's all we can do ...