I actually know a Brown girl who applied ED to Brown after falling short at an offer, got deferred, spot opened up, and Brown coach was able to reverse her deferral and pull her right in.
So I don’t worry about getting rejected, there being a spot, and coach not doing anything. Brown could reverse the deferral, so I assume Princeton could do the same.
No that girl did not end up somewhere ED2, but an RD. Still a great result too. Counselor has told me I have a better SAT than she does, worse grades, but more course rigor, specifically AP BC Calc which this girl did not have (only AP AB Calc) and that Princeton supposedly cares about.