Jo-Ann, I bet if you took a survey we would all confess to messing up now and then. Most of us are not scientists with controlled operations. We just simply love to root cuttings and watch them grow into something amazing. After a few failures, we kinda figure it out, but not always. There is that outside chance we will mess up!
I use my double cups, and you have seen one. There are lots of air holes in there, and lots of roots. Where there are a lot of roots, do not fear! The plant will live. Some leaves may wither and drop, but as long as you keep the dreaded fungus gnat away, you should be fine! Oh, and if there are leaves, you need to water more.
Good luck!
Suzi