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So this theory completely unrealted to the Watchers, but is about the relationship between Bdubs and Scar (GTWS) specifically an invisble bondage otherwise known as a soul-link or soul-bound between them.
Take Season 7. When Scar was elected mayor over the Shopping District, Bdubs by himself, volunteered to be the assistant of Scar. Thus establishing the soul-link bond. And during his mayoral leadership, Bdubs was there supporting Scar during the Mycelium War and other events. Strengthing the already established bond.
And then there's Season 9 with the infamous RenTheKing council which included Scar as the hitman of sorts and Bdubs as the assistant to Ren along with the other members of Cubfan and Cleo. So more soul-link and bondage moments which reinforce the theory that Bdubs and Scar may have a soul-link forged way before the events of the Life Series.
So I guess soulmates be bromates.