There's no MVP during TI as far as I know but they have been setting records since the start of the tournament. Don't forget about TORONTOTOKYO, he also deserve to place the spot for being an MVP. Well, all of them actually are viable to become MVP but it's hard to choose only one.

I don't think that there's a need for nerfing Magnus. It's just well played by Collapse. But for those who are in the pubs, brace yourselves then you'll see a lot of Magnus.