Too many variables for this question...if a dude beat skolas a million times in year 1, is he skilled? Yes in a sense but does that skill transition to strikes, raids, or crucible? Maybe, maybe not. If a guy has every crucible grimoire is he skilled? In pvp perhaps but how will he do in a raid? Who knows. The only one way to find out if a person is good is to play with them.. never judge a book by its cover so the saying goes.