Hi Ray, you probably are not interested in my opinion about it, since it can be kind of biased;) but ill give it anyway, and you please judge how if it makes sense to you, and please let me know.
let me just say that I also find the manual very limited, it just describes a series of sequence of moves, for specific situations, but that are actually very generic, without talking much about the tactical decisions behind it.
But as far as I understood, mostly mentions by people that are studying seriously this manual and similar ones, this is a more common practice on Portugal and Spain, and not very much seen on the rest of Europe.
These manuals focus on solo drills that often are multi directional, 2 directions or 4 directions, this is clearly(stated by the authors) for combat in outnumbered situations, the larger size of the montante compared to the long sword favors that situations too.
Now, some more personal view,
In the end of the book the author mentions that those rules are to be used combining moves as the fencer feels necessary
“no swordsman necessarily should do this or that rule, but rather he should take from them all
what he best understands and that serves him to defeat his adversaries, linking one rule to another with such prudence that neither haste will confuse the memory”
that for me means, that the next step in practicing, after you have the moves controlled, is to practice distance and timing, in diverse situations and apply the moves to specific need of that ramdon situations, and not just do solo drills.
so, you should evolve as a fencer from this kind of practice where you are practicing the moves and blending between them:
http://www.youtube.com/watch?v=VQ9gK3yECyM
to something like this, where you are reacting to the environment and thinking on the instant where, when and how to strike:
http://www.youtube.com/watch?v=ZmlcCcGoH5s
this, to someone that doesn't know what is happening, can look like just a bunch of sloppy old man hitting staffs, but they move around and look to manage space and distance and strike with powerful strikes that you wouldn’t want to be in the way, and not just light tapings.
Also, there is much more tactical complexity in multiple opponents combat than it looks like and is not described in the old books, Luis Preto will soon publish a book on outnumbered combat, based on jogo do pau system, and If I know Luis, it will deal with tactical decisions in depth.
now, take in consideration that combat in outnumbered scenarios is the most practical self defense skill one can have and you would find yourself most often in. unless in a very formalized dueling society where 2 people are fighting and the rest just watching. This is surely the most practical skill most people should practice for practical reasons. Not only that, but even the best one on one fighter, should be skilled in multiple opponents technique, to have a full control of the weapon, in multiple directions.
I believe that this kind of practice, suggested by Dom Diogo and found on still living arts on traditional groups is very valuable and is actually something that can still be practically used today, for self defense.
this is a local MMA guy that practices jogo do pau, in this case baton, and applies it to multiple opponents sparing, because he believes it it’s efficiency, not for any cultural or historical reasons.
http://www.youtube.com/watch?v=qLGjSk0hezI
I personally find it interesting, that something similar to what was done with the montante and probably influenced by it, can still be utilized today practically and not just as an historical sport activity.
but please, I can't say that this is all for sure, let me know what you think about it and I would like to know if other people think of it and if it is reasonable or not.