Subsitution key on f1r

[Bluetoes101]

Did Lisa share work on how column 1 and 3 were deemed to be Marci / the same hand? Could someone provide a link if so?

I'm just curious as to me the letters to not look the same. In one "e" is written like a backwards "s" (assume this is the little flourish above "e" we see a lot, but done more crudely) the other it looks like "c", in one "q" looks like "q" but in the other "4" and so on. Smaller differences are certain letters have a little flourish to end the pen stroke, where in the other column they do not seem to. 

I get it's zooming in on tiny letters on damaged material and so on, I'm just interested in seeing Lisa's work on this and improving my own knowledge a bit. 

Some other thoughts, 
Do we have any reason to assume the rightmost column is the "corrected" one, or "attempt 2" etc? It is the one that is not in line and has a big correction around "h" after all. 

It looks like the worm hole(?) was in place before the columns, judging by the "--------" lines joining column 2 to 3. 

"Why did they start column 3 above the "alphabet"?" Obviously one answer is whoever did it thought the alphabet shifted, but it still left them nothing for "a" - I started wondering if whoever did it took the 2 red characters to be the start of a cipher alphabet or something and carried it on.. it would give them the 2 missing characters for "a" in column 3..