Haha, yeah that happens I guess, mother nature can be cruel at times...but hey, five is better than four. You'd get some nice blossoms on that tree right? That's something to take away I guess, although not as enjoyable as smashing down sweet juicy fruits.
May you have more plumcots than you can handle in future years. I'll be happy to alleviate the burden by taking some. It's a win-win.