The reason why I put TH 5th is mainly because EMEA is a weaker region compared to AMER and APAC. They also struggled with VIT who are still figuring things out (albeit VIT did have double map ban).
Also the Neon nerfs. It won't affect them that much but Kosh still does do the jumping thing even though it's not as bad as say like Dambi. It may make him a little uncomfortable on the agent though if they continue to play it and if they don't play it, they're fucked.
I will say though that like 2nd-7th is interchangeable but I just think that G2, NRG, and FS either have a better meta read going into London (and have Primmie) or are experienced teams that will adapt quickly to the changes.