And if you took that into a court with competent opposition you would be laughed out of court. If you have to explain what it means you fail, you need the expert to tell the jury specifically that the voice can be verified as not being Zimmerman without a doubt, otherwise the opposition will turn it around and use it against you.
Read this
http://www.audioforensics.com/PDFs/VoiceIDpaper.pdf
Then talk about what your percent match means as it pertains to positively excluding somebody vs. positively identifying them.