I don't think TL's run was a fluke. Their Haven loss against Gentle Mates was a bit unfortunate, but it seemed like a fixable situation as they get their comms in order and Serial gets more comfortable in his new role.
TL vs BBL are on more equal footing in my eyes, actually. It might come down to map vetoes. TL bans Pearl and BBL bans Split, probably. Both teams ban Lotus and doesn't have an impressive Icebox, so it might come down to who has the better Ascent. And I am kinda favoring TL here, because TL might just run a double sentinel comp since Serial is a sentinel main originally. At least, I hope they do, because we have seen how strong it could be in the right hands.