And we can add general resources
Sister PBF Threads - plus more can be found in this section!
Eugenius Bulgaris on the solecism
Ilias Theodosis explains how the poetry of the heavenly and earthly witnesses affects the grammar
(includes the Frederick Nolan figure attraction material)
Nathaniel Ellsworth Cornwall examines the short-text solecism apologetics
Barry Hofstetter - Spirit is personal, three masculine witnesses