Here is the thing, it is extremely difficult, if not impossible, to teach a player a position that relies a lot on instinct, natural ability and vision. if it could be done, why are we waiting until Nikorima turned 23 before we started the process? and why have we not been able to do it for the numerous halfbacks that we have had since Alfie retired in 2002?
you can teach some of the individual skills, like kicking (if you're name isn't Hunt :p ) passing etc, but if you don't have the natural ability and a sharp rugby league brain, then while you may be able to do a job, you'll never be elite.
no of course there are exceptions to every rule, but they are exceptionally rare, in fact, so rare that the only example anyone has been able to come up with is Cooper Cronk. and we are about to find out just how good he is without having one of the best rugby league minds in the business by his side every game.
Now of course Nikorima may have that natural ability inside him, and it may simply be a case of needing someone to help him access it, this could be where Walters comes in handy.
or it could be a case of Nikorima being a good athlete and being able to do a job, while his halves partner, who does have that natural ability, works his magic.