Conversation so far:
Who was the leader of the group ?
Hoppy Jones, an important personality to the group, died in October 1944.
Who was the lead guitarist ?
CANNOTANSWER.
Who else was in the group ?
Charlie Fuqua was drafted into the US Army.
He chose his friend Bernie Mackey to be his temporary replacement.
Did he come back to the group after he left the army ?
Mackey was replaced by Huey Long in March 1945.
Long completed the role as a "fill in" until Fuqua finally returned in October 1945.

Question: Who else was in the group ?
Self-contained rewrite: Who else was in the Ink Spots besides Hoppy Jones and Charlie Fuqua ?