Nothing has changed in the meta since the last Tier List. Six Samurai remain the deck to beat and has continued to dominate the top cut of tournaments despite the many "hard counters" being used in main decks.
Six Samurais remain at Tier 0 by still having the upper hand against every other deck. The latest lists have opted to Loading... builds which has a more consistent way to have the combo of Loading... and Loading... (which has proven to be better than Loading... ) on the field as turn one play and also have better turn two plays in the mirror and other match ups. Also, with the latest rise of Stall decks, Six Samurais started using cards such as Loading... and Loading... to out the monsters that Stall decks use (e.g Loading... , Loading... , Loading... ). The latter shows how Six Samurais can easily adapt to anything and that makes them the most powerful deck, especially in a side deck format. The meta will remain mostly the same till a new banlist is announced or a new box power-creeps Six Samurais.
Six Samurai continues to be extremely dominant even through all the counter cards people are maindecking vs them. It seems like Loading... becomes more and more popular after showing success in the recent KC Cup. It allows the deck to make more plays in a single turn, pushing through an opposing Loading... as well as cards like Loading... and Loading... . Asceticism also gives the deck quick access to Loading... which makes them able to OTK through a set Loading... or Loading... .
Although Koa'ki Meiru are not played massively in tournaments, mostly because a small amount of people have access to the KaibaCorp Bling version which is the best way to run the deck, they still have favorable match ups in this meta and their potential to OTK at any point makes them more powerful than other decks.
Although Koa'ki Meiru didn't show as much success as some people expected it to, if we look at the overall deck breakdown we understand why. The deck being hidden behind a massive paywall makes a lot people who would like to use it unable to. While that means that Koa'ki wont show a lot of results, it doesn't take away from the deck being extremely powerful and in my opinion the second best at the moment - it won the KC Cup after all.