How to square handwriting variation?

[oshfdk]

There is a lot here that I don't think is wholly down to handwriting variation and the difficulties of writing small, though that could well be in play too. The first character looks to me like an s stacked on top of an e, not just the usual flourish added to an e, and very deliberately so. The second word has a well-formed y over it, not just the standard flourish. There is also the standard paleographic comma in the middle that I cannot make sense of and does not appear in the Takeshi transcription (I did not check others).

I'd say the first s looks like a very normal misaligned s. I think (almost) all of s are written with two strokes that are misaligned quite often. Loops in flourishes happen quite often too, and "arin/ariin" combinations do occur a few times, so this could just be saiin sarin, with sloppy pen work that caused misaligned flourishes. If, on the other hand, you consider steganography, this could be anything.

Note that the grid on your images is roughly 10mm, if these are just errors from unsteady hand, these are tiny and may have not even warranted fixing from the point of view of the scribe.