It's back! Thanks, ginsai.
With the new group a lot of translations have changed. Eito Shiguma is now Eight Shikuma.
And they're using japanese position names. For anyone else who was confused, here's what I've found online:
"Post" is usually called "pivot", "center forward", or "circle runner" in English.
"45" is either the left or right back (as seen in the diagram in Ch 3). Dejima (#7) appears to be playing right back from the art.
"right side" is right wing, you probably could guess that one.
Not sure what "archer" means - maybe just any player who's expected to shoot often?