Kongo is not exactly renound for his takedowns and grappling to be fair.
Kongo is actually renown for his grappling and take downs. The majority of Kongos UFC wins have been from dominating the clinch exchanges or scoring take downs and landing brutal GNP.
One of the biggest myths in MMA is that Kongo has no wrestling/grappling game. I've absolutely no idea where it came from, because it's completely false.