#3 The Fiend is The Club's mystery member
The Club reformed on the latest edition of Monday Night Raw, and the WWE Universe immediately began clamoring for Finn Balor to join the faction. Let AJ Styles and team tease a new mystery member for weeks on end. This would create intrigue among the fans and provide them with a sense of hope that Balor might rejoin the Club.
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Eventually, Styles introduces the newest member of the Club, The Fiend. A lone wolf like The Undertaker has led factions in the past, so Wyatt doing the same shouldn't be ruled out as a possibility.
With Styles and The Fiend at the helm, the Club could become the biggest faction in WWE for a long time to come, leading to a string of exciting rivalries and dream matches. The Fiend could be used in a limited capacity by the Club, only when they genuinely need him, which will ultimately help keep his aura intact.