Calling Vitality more skilled is just false. They have better teamplay and strats/reading the opponent but mechanically NaVi is way stronger. s1mple and electronic are both top 5 players in skill. Then you have a fragging IGL in Boombl4, flamie who pops off out of nowhere and drops 30 once in a while, and Perfecto.
ZywOo > or = s1mple
ALEX < Boombl4
Rpk < flamie
We dont know much about Perfecto yet so he could be better than apEX idk
shox < Electronic