Really comprehensive, Steve. I think you’d also be interested in the fact that “The Road Not Taken” was a poem first sent to Edward Thomas, and Thomas thought the poem was an attack on his indecisiveness and anxiety when it came to making decisions. It’s said that the poem heavily motivated Thomas’s choice to enlist in World War I.

“To E.T.” was a poem written in his memorial.

https://www.theguardian.com/books/2011/jul/29/robert-frost-edward-thomas-poetry