It doesn't matter that he may want to move heaven and Earth to improve, I always want to improve, doesn't mean I'm going to get a test call up is it for pure detirmination. A Keeper playing at International level should be able to keep well to spinners tbh. Even Geraint Jones in India kept fairly well against our Spinners, so Surely an Indian brought on up on those wickets should do a better job. There's a reason Gilly does'nt keep to two Spinners, because Australia don't usually play 2 Spinners, And they have in the past and he has done it very well so that just demolishes your arguement on that front.
He Might stay down low, Watch Keepers around the World, Staying down low is no longer taught as an nessersity because it us to the Keeper, staying down low has many factors around it, such as Height, I'm fairly sure that Dhoni is taller than Karthik therefore, Dhoni has to stay down lower because his upright body position would put his hands to high whereas it's the opposite with Karthik he gets up quicker so he is in a better position.
He has a good eye, I'm not disagreeing but thats what makes him such a good batsman because technically with the bat he isn't great as well but his eye gets him out of trouble most of the time.
Your claiming him to be the 2nd best keeper india has eve rproduced after less than 50 Test matches? What Stupidity, He's not even that assured of a place. It's a ridiculous statement, As a Keeper he's not the best around in the World in fact in my list he'd be very low down. Gilchrist, McCullum, Jayawordene {sp}, Read, Foster, Davies, Karthik, Ramdin, Taibu are all better.
Your arguement would stand up if you were arguing that his Batting is better than Karthiks but your not, your going on Keeping ability and technique and it's a completely misguided arguements because he's fairly average in both departments for international level.
In My Opinion your buying too much into the stardom surrounding essentially a very average player. He's been billed up as a hell of a lot better than he actually is.