Five...I am the (Original :) Ninja Turtle!
Clearly, the authors of the article don’t know of Dr. Masaaki Hatsumi of the Togakure Ryu.
He is the 34th Grandmaster in a long, long line of Bujinkan Ninjutsu.
I guarantee the “last ninja” engineer does, though.
Dr. Hatsumi trained Shidoshi Stephen Hayes, who brought it over here.