well, it doesn't work like that in EU. Not anybody can come in and destroy, you need months of experience. KEY study cases:
1) olofmeister, couldn't make it in the fnatic roster and they picked up derke and magnun, even though in CS they were so shit compared to him.
2) jamppi, it seems that his move was really forced and he is still not up to date in terms of skill with the other liquid members. 2 months in.
Both of these players were actually better than tarik in CSGO and they couldnt make it. In EU, as it seems, you can't just jump in with the hype from another game and dominate as easily as (let's say) ethan did.