I get it, it's to big Rafa up, but really it's not needed, because Rafa had won too much anyway to be denied the top spot.
Clay is Djokovic's weakest surface, we know this, it's the one he is most vulnerable on, it doesn't mean he is bad on it, in fact he is fantastic on it....but there is a clear gap that can be seen in his tennis outside of clay compared to on it. That is why many other players have taken out a well playing Djokovic at RG, Federer, Wawrinka and Thiem all did it, where they basically just him off the court, and this was during periods that Djokovic was winning three slams within 12 months.
I do feel achievement wise, that now Djokovic is top 3 of the open era, it did however require help from Nadal making him the player he is today. Who knows if without Nadal he wins so much and is even more vulnerable to those Federer/Wawrinka/Thiem like performances from other players.