Yde
Worg
Why would skill be exclusive to anything? To define skill you have to assign something to be skilled at.
If you want to observe skill at using class abilities most effectively, timing and positioning, that's almost exclusively observable in arena, sure.
Not really always gleaned from arena stats, but observable. But skilled arena players could occasionally have no leadership skill, patience, perseverance, be unskilled at motivating others and be someone you'd not want alongside you in a BG.
But these are also hard to judge by stats. People are confident in calling someone who has a good stats a good BG player only if they have observed him play. I don't think anyone would make such a confident statement about a player with excellent stats that they haven't seen play.
If you want to observe skill at using class abilities most effectively, timing and positioning, that's almost exclusively observable in arena, sure.
Not really always gleaned from arena stats, but observable. But skilled arena players could occasionally have no leadership skill, patience, perseverance, be unskilled at motivating others and be someone you'd not want alongside you in a BG.
But these are also hard to judge by stats. People are confident in calling someone who has a good stats a good BG player only if they have observed him play. I don't think anyone would make such a confident statement about a player with excellent stats that they haven't seen play.