In regards to the Holy Ghost, I think that it has to do with Deity
1 John 5:7
"For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one." (verse omitted from NIV)
Modern versions remove a witness, the Holy Ghost, therefore the Godhead is denied
as for the case issue, I honestly don't know, But in All cases the Holy Ghost is capitalized, referring to him as a person and a member of the Godhead
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