2, I have them for the Hylians in Hyrule Conquest: Revival.

That section can expand vertically to accommodate the extra stats (or there could be a vertical scrollbar). The Historical section can shrink vertically to give room, since it has a scrollbar. 

I was thinking that because it seems you'll need way more stats for some units (for kinds of damage, range, spread, etc), then icons would give you space for a 4th column, if not also a 5th one.

You're assuming it's a game, and the problem is that it would stop being fun. Games have internal logic; you don't expect that much realism. Games have a fun curve.   Why does realism sometimes harm the experience? Fun Curve: In video games, extreme realism often makes controls worse. Selection of Details: The human brain ignores many things. An excess of realistic details can distract from the narrative. --- Not to mention that it ruins the experience.

https://game-studies.fandom.com/wiki/The_Art_of_Game_Design:_A_Book_of_Lenses?__cf_chl_f_tk=fa4sKWZua3gfigepm6bbTQxdawl.9m8tH11Ybr6uiK8-1783016138-1.0.1.1-M854n8mjY6x1rfJt5zx3Fs0JvutGq7w3_zukY9AIIto The Art of Game Design: A Book of Lenses ISBN-13: 978-0123694966, ISBN-10: 0123694965   It is a good source that explains the balance between fun and when a game is no longer fun.