My theory that nobody cares about is that only one of them will operate at a time. That way, nobody will know how Batman is so tireless and mysterious, while still allowing both to keep the mantle and aiding Bruce’s quest to fool the Justice League at all turns. What’s more trollish for him than being RIGHT UNDER THEIR NOSES?
Suddenly, I receive a vision from the heavens! Bruce Wayne walks into the JL headquarters, and the JL ask, but if you’re there… who’s here? And all turn and look at Batman. Ah-ha! Says one member. This must be Dick! But! Then! In walks Dick! So who is Batman?
SPOILER WARNING: IT’S AN ALTERNATE PAST FUTURE CASSANDRA WHO IS TRYING TO STOP HER DYSTOPIAN FUTURE FROM COMING TRUE BY TUTORING HER FUTURE PAST SELF INTO A BEING A BETTER FIGHTER BY BECOMING THE ONLY PERSON SHE TRULY TRUSTS BUT IN HER ALTERNATE FUTURE REALITY IT TURNS OUT SHE’S ACTUALLY DICK’S LOVER AND THEN SOME GHOST FROG ALIENS TURN UP AND SHIT GOES DOWN