Frank VanLenten in Official Karate

I read this piece by Frank Van Lenten long ago, and typed into my files. I then saved it on my blog in 2016. Mainly because he discussed his training in Isshinryu with Shimabuku Tatsuo.

https://isshin-concentration.blogspot.com/2016/05/frank-van-lenten.html

I have never heard anyone from Isshinryu discuss it for accuracy.

I never met the man and have no other knowledge about him.

For some context here is an article about Frank VanLeten from Official Karate.