How to square handwriting variation?

[quimqu]

I just looked at some examples or s and r from same page

I have been thinking lately about the e and i forms that compound the majority of the glyphs (apart from the gallows). Those s and r look easy to write in a single stroke... Why should they be written in two strokes if they could be written in a single stroke? Were the e and i that compose those glyphs written firstly?... why? What is the role of e and i parts in the Voynich writting?