Opinions on: line as a functional unit

[JoJo_Jost]

It is Mongolian to me... Are those detached letters on the left margin just the first letter of the first word?  As in another MS that was posted recently?

If so, what would be the justification for that layout?  Just a fashion of the times?  Helpful for reading?  A side effect of how the scribe worked?

The letters are the first ones of the first word:  
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2. I actually wanted to find out why this was done before I posted it. But it just happened to fit here. I only have a very vague guess:

Attention, unproven personal theory:
As you can see in the image below from the structural lines drawn, the initial letters are given “more space.” This could be because capital letters were often at the beginning of a line. Since they were often drawn more artistically, they were given a little more space so that these beautiful glyphs could be seen and read better.  And so a kind of “fad” arose.

What is unusual, however, is that in f49v.1 and f49v.16, there are at the beginnig of a line two gallow glyphs directly after each other, and the one in line 16 has also slipped.

In 66r, they are also partially misaligned, or the circle that looks like a small "o" belongs to the corresponding glyph (which would support my thesis that the original text had more information than the current one and that this information has disappeared for various reasons).

And here there are also whole words in front of it, too. This, in turn, is all very mysterious.