From what I can tell only the latter two are actually "official" (although wildturtle did play for tsm at iem and is in talks with dignitas, it isn't 100% done just yet).
I don't want to bury something before it's actually dead, but the prognosis on IMT for next split isn't looking good. Losing one player from a high-quality team is never a good thing (look at what happened to c9 when they lost hai last year), losing two can be ridiculously detrimental (look at what happened to OG last year), losing three in what is realistically a "dead" UFA market to teams in their own region is probably the worst thing in the world right now. Even if they keep huni/pobelter (both of them being ridiculously valuable pieces, the former potentially being a good "1-2 punch" on echo fox and the latter on the new dignitas team), who do they move forward with? Assuming all UFA's are taken into account, their roster will at best be -Huni-Contractz/Moon-Pobelter-Forgiven-Gate-. Nowhere near what it was this year, let alone a "top 5 NA team".
Oh, and if this IMT-exodus teaches us anything, it's that teams should be more careful with their players. Letting them explore other options/telling them that they only want "players who want to play for the organization" probably isn't the way to go when you have 5 of the best players in the western hemisphere.