I doubt it was estrada who was the main reason for Umaga going over... Umaga can work and he's over as a heel and even gets some babyface reactions. The Umaga character is one of the best in the last few year, and I would already rank him as one of the top ten monster wrestlers of all time.
I hope he gets back quick and they actually push him when he gets back. Because Khali already got his time in the main event and even got a title reign, and even I'm sick of seeing Khali in the main event.