I'm not saying it's definite that he was, I'm just saying that if some of the experts (let alone a reasonable amount of them) regarded him as the best keeper, that he's definitely not so crap as to be dismissed in the fashion that Jason here is showing.
As for Healy/Russell, I won't talk about what I don't know, but what I do know is that they weren't playing test cricket after 1999 and it wasn't until after 1999 that Parore was at his best.
For all we know, there was some wicky over in India who might have been the best in the world but was never brought to test level and therefore nobody ever recognised his ability, so I'm not going to go down to county level either. I'm talking international level.
Either way, I'm not going to say outright that Parore was the best of his time, but I will say that I firmly believe he's the best wicket keeper NZ has ever had, and that he was, at his prime, the best wicket keeper at test level.