It is still there, the story hasn’t revisited it. Tara swore she would never reveal their existence. But knowing about their gun stash, she might just spill the beans?
Yes, I think we all know in the end it will be Hilltop, the Kingdom, the Amazons, the new chick and her kooks, and Rick’s people in the finale vs. Negan and probably his blonde sidekick (who will betray him and die in the effort).
Am I close?