Watching the other English Leggies this year, Beer (not so close) and Briggs (played for England before), They are both very similar to Rashid in terms of dragging it down and trying to over spin it like warn did from outside leg. it's fair to say that wickets don't offer that to these type of leg spinners, they bowl from a higher release point than Warne used to, but warne changed his pace alot aswell. Being able to throw a few leggies myself, i can confirm it is a hard trait to perfect, and there is a fine line between that good ball and a rank ball, the line being far smaller than it is for the off spinner. I have noticed though that quite possibly Rashid's run up doesn't give him the consistency we are asking for, Warnes was a slow walk to the crease and a quick gather, rashid's is quick and maybe he get's a bit over excited and slows himself down on occasion coming to the crease which can put him off rhythm? Just a theory... as im no coach, but there isn't a coach in the england set up to tell him any different so all he can go by is his fellow batsman's words and his own personal feel