I never said they weren't good (in fact if you actually read what I had said then you would see that I said that they are good) however he hasn't had much of a chance to prove himself against actual top tier opponents. He went mental against Dignitas, but I need to see more from him to put him above Olof, Guardian, and Fallen, but since you clarified that these are people 21 and under, I can see how he might be in the top 10. Twist had an incredible performance at Malmo, Not top 5 though, there are way too many good young talents. My personal top 10 21 and under would be:
Xantares and Twist might be as good as or better than the people I listed, however they haven't had a chance to prove themselves against tier 1 teams like most of the people I have listed (Xantares especially). Personally I hope they will get a chance to prove themselves soon cause I think they eventualy could be on the upper half of this list. Unfortunately SS got bodied out of the minor qualifiers (and if Xantares can't perform enough to win against a team like Game Agents, how is he going to do it against a tier 1 team). Godsent however is in the minor and Twist will get more chances to prove himself against very good teams like Hellraisers, Dignitas, and of course ENCE.