How many people penned the main Voynichese text?

[N._N.]

It's interesting that by some opinions being expressed more vocally than others, one can get a warped view on the situation.

This is an interesting observation, probably not just in regard to this particular question, but also (Voynich) research in general. There is just no need to be vocal about your opinion if it is basically being open to both the standard theory and the latest research.

I went with option 3, more than two, for three reasons: Firstly, while I have not researched this question in detail myself, I find Lisa Fagin Davis' arguments compelling, even more so since the latest developments suggesting that the manuscript was not bound as a book originally. This makes a group project seem much more likely as well in my opinion. 
Secondly, as soon as we assume two people were involved, there has to have been a moment of teaching or shared creation when knowledge of the script (or knowledge of the generation of convincing gibberish) was passed on. If this is the case, why stop at two? Of course, the VMS might have been the work of a married couple, of a father-son duo, coincidentally two people of a larger group which had originally developed the glyphs etc. However, most monastic, scholarly etc. contexts offer no particular argument for exactly two people.
Thirdly, while I would not rule out the idea that some 'hands' are just different phases in the life of the same person, I find this idea hard to match with several aspects of the manuscript and its probable practices of creation such as the relationship between illustrations and 'text'.