Just to throw out the conspiracy theory as food for thought. There's a very large camp of people who believe that TSM intentionally performed terribly at MSI. It's the last international showing before worlds, which everyone on TSM will tell you in a heartbeat is their main focus anyway. It allows them to underplay their abilities in an international competition, and make themselves seem like less of a threat than they are. It's actually a pretty clever tactic.
If you watched it, which it sounds like you did, you must have noticed that Lustboy as the most roamy support player in NA, didn't roam much at all, especially on a support literally designed to make you roam, there was basically no reason for him to sit top with WildTurtle, which the casters even mentioned several times. Bjergsen didn't play any playmaking champions, he didn't roam like he always does, he basically sat still and farmed all game, every game. For the North American MVP he had the lowest KDA of all mid laners except for the mid laner from Besiktas, he had a .8 KDA, it matched Dyrus who was the one getting camped all game every game for god's sake. It genuinely looked like they didn't try at all.
Now I know a bunch of people are just going to say TSM fanboy making excuses for the team, but seriously, they didn't win the NA spring split playing like bronze solo queue, which is what that looked like, believe me I know, I play in it. At any rate that's the conspiracy theory.