The reversal was a completely correct call. As has been mentioned he was in a perfect Merkel position, leg in and behind Taylor with both arms under Taylor's arms. If you watch the flo video, at 9:44 you can see both of Taylor's feet and one of Dake's feet on the ground in bounds. The official begins signaling for the reversal at 9:45 of the video. Assuming a slight delay between seeing the points and signaling, he saw control before they left the mat.
As for the escape at the end, I can't say since I can't see Dake's hands. The official points directly at where Dake's hands would be as he signals no points after the buzzer. That leads me to believe that the hands were still locked or at least touching enough that no escape was warranted.
Good match. Neither guy did much and Taylor made a mistake at the wrong time and Dake took advantage. Both guys were very tentative on their feet and rather sloppy on the mat by both of their standards. I just wish the officials would force these two, and others like them, to open up and take some chances on their feet. This dancing around blocking with the head and tying up with no actual attempts at offense is pathetic. The second time the official had to call a stalemate with both guys simply tied up on their feet was the perfect time to warn both of them for stalling and it would have been the correct call. They only wrestle that way because the officials lack the spine to call stalling as it's written in the rules.