Conversation so far:
What was the Hellfire Club?
Instead of being chosen for the first X-Men class, she is instead sent to spy on the Hellfire Club as Tessa.
Why was she sent to spy on them?
Years later, Sage meets up again with Xavier, who at the time is recruiting the original X-Men.
Instead of being chosen for the first X-Men class.
Why was he recruiting  them?
CANNOTANSWER.

Question: Was he successful?
Self-contained rewrite: Was Xavier successful in recruiting the original X-Men?