Honestly that really helps with context, although I think the comparison of capitalizing other pronouns with a capital I is based on a misunderstanding of why I is capitalized.

I is capitalized due to a common way of writing the letter to avoid confusion with similar looking letters in manuscripts due to how the letters were shaped, similar to some spellings are a result of the printing press where the letters f and s were sometimes switched.

Still it is interesting in an e e cummings not always following the common capitalization practices kind of way.