On the inconsistent stroke order for 右 and 左


In the manga _Tomehane!_ , which revolves around a high school calligraphy
club, there's a rather convoluted historical explanation for the differing
stroke order of the "right" and "left" kanji in the standard script on the
basis of their sources in the older seal script:

[![enter image description
here](https://i.stack.imgur.com/tFv6A.jpg)](https://i.stack.imgur.com/tFv6A.jpg)

[![enter image description
here](https://i.stack.imgur.com/KfNm6.jpg)](https://i.stack.imgur.com/KfNm6.jpg)

[![enter image description
here](https://i.stack.imgur.com/lQYvT.jpg)](https://i.stack.imgur.com/lQYvT.jpg)

Sorry for being dense, but I can't fully wrap my head around sensei's
argument. Which parts of the seal script characters are supposed to correlate
one-to-one with which parts of 右 and 左?

