YOU SAID:
losing him was dark grey all alone
INTO JAPANESE
彼を失うことは一人で濃い灰色でした
BACK INTO ENGLISH
Losing him was dark gray alone
INTO JAPANESE
彼を失ったのは一人でダークグレーだった
BACK INTO ENGLISH
It was dark gray alone who lost him
INTO JAPANESE
彼を失ったのはダークグレーだけだった
BACK INTO ENGLISH
Only dark gray lost him
INTO JAPANESE
ダークグレーだけが彼を失った
BACK INTO ENGLISH
Only dark gray lost him
That didn't even make that much sense in English.