I’ve never heard of “tabuteau numbers”, but it sounds a fascinating way of thinking about phrasing. I follow a blog called “Kodaly and Orff Music Teachers’ blog”, written by Susan Gonsalves, which you can find here
I’ve pointed you in her direction before – remember “The Cup Game“?
Her latest post give a full description of this method of analysing and quantifying the intensity, rather than the dynamics, of a phrase.
Definitely worth a read if you haven’t come tabuteau numbers it before.