Wings yesterday just played badly for most of the games (with some small exceptions like defending the bottom lane in game 1). You can't look at those games and tell me with a straight face that it was business as usual for Wings and that they won TI by playing at that same level and getting lucky that they were against opponents who just happened to play even worse.
They've always had hints of playing like idiot savants. Remember Techies/Pudge in TI? They picked Pudge like 3 times and lost every game but just kept going with it. People remember when Wings goofy drafts work, but conveniently forget all the terrible results. Wings had a good run this patch, that's undeniable, but they have clearly not been a top 3 team since TI6. VP, EG, Newbee, and OG are definitely better, and I would even say LGD and Ehome are on par or better. Yea, Wings won Beat Invitational and Nanyang, but they were honestly pretty weak at Summit 6, and as this meta has settled they just aren't a top tier team.
But lets go back to TI6. Let's look at a few matches.
Wings vs. Na'vi. Na'vi 2-0'd Wings during the Group Stage, and the drafts show a few of the things that Wings was weak against. The first game has Na'vi letting Drow through in favor of banning Oracle, and Wings immediately ban it because Na'vi can play a solid Drow. Banning Oracle was the best thing a team could have done, Wings finished Ti6 9-0 on Oracle. From that point on Na'vi took aggressive heroes that didn't reveal too much--Wisp and SK. It's a versatile pick that means Wings can't really counter it so they have to lock themselves into a non-committal draft as well, and from that point on Na'vi is beating them every step of the way. Now the even bigger thing to take away from this match, was Chen. Chen is the kryptonite of Wings Gaming. It represents everything that counters Wings style, and if people had dug into their history they would have seen that--the issue is everyone was so focused on Drow and Mirana strats they didn't bother trying to play their opponents, they were playing the meta.
The other important series that Wings lost was against TNC, and whether Jimmy realized it that time, he outdrafted Wings so hard it was comical.
First game, Wings bans ET/VS, and TNC bans Mirana/Kunkka. TNC then takes Wisp, an open pick that gives them options, and Wings immediately snatches the Drow/Dazzle. In most peoples minds this was a huge mis-step because the thinking going into this even was that Wings were basically the pioneers of Drow, and you had to ban it against them. TNC counters with Axe, the hard counter to Dazzle and a hero that gives Drow a hard time and can pair decently with the Wisp. TNC immediately bans out Huskar and Storm, which means their options for a mid are basically WR/QoP/Medusa, or someone bad. Wings takes WR, fully committing to the Drow Strat and Jimmy snags KotL for depush. At this point Wings needs a roaming hero so they take NS, and TNC take PL. That pick basically ends Wings chances of winning. They have nothing to deal with PL. They ban out Sven hoping it's a mid PL (big in SEA) and then TNC takes Naga. Wings has literally no choice but to take a ranged hard carry that can deal with 2 illusion heroes--that are both direct counters to her--in Medusa. TNC gave Wings everything they could want with this draft, a nice defensive support, Drow, WR, and Medusa, and still won.
The second game was basically the same story, but even more revealing. TNC forced Wings to commit to a Drow strat by giving them Drow/VS first phase, after taking an IO, and then banned out the 2 defensive supports that Wings loved--Dazzle/Oracle. The key to beating Wings was not letting them control the draft, and everyone was so caught up in how effective Mirana and Drow were, they jumped at the chance to play them immediately. Wings wanted to play against Drow and/or Mirana. They then took DK and Axe, and TNC wins the whole draft with a 4th pick Timbersaw--a hero that counters most of Wings cores and Wings has no real answer for.
Wings was not unbeatable or "anti-Meta" at TI6, people were just distracted by their crisp execution of playing against the "in Meta" strats that everyone else ran. When pushed out of their comfort zone they looked lost and the key to that was defensive supports. Without them Wings couldn't play aggressive and it broke their ability to perform. Wings didn't win exclusively by getting lucky, but the fact that only 2 of the more aggressive and "lower tier" teams were the only ones to try and force them to make early commitments to strats.