Quality control in aikido is difficult since there is no competition, no common goal and no common standards across aikido schools. Everybody is doing his own thing. That said, there are technical teachings which are consistently taught by several authoritative aikido teachers, and it is easy to demonstrate that Rokas' aikido has never complied with these teachings. Furthermore, the same wrestling principles that he uses to "fix" it correspond exactly to the correct application of these aikido teachings, as seen in the videos I have posted. Simply put, from a technical perspective, he's bad at aikido.
So Rokas does not represent the aikido community as a whole, as lots of them don't share his goals. Moreover, he does not even represent correct aikido technique, as he demonstrably lacks very basic technical skills. Because of this, it's impossible to draw general conclusions on aikido from his videos.
The lack of videos of aikidoka "proving themselves in combat" against whatever is another topic. First of all, I don't think many aikidoka are interested in this. Among these, few would be willing to go through the hassle. And among these, even fewer would be capable of pulling it off. On top of that, in the end it would not prove much about aikido as a whole, as said above.
Yu Shiori is a Shodokan (Tomiki) aikido champion with a 9-3-0 record in MMA. He now teaches aikido and MMA. One can see him pull off a waki-gatame from standing at 3:33 in the video below. So what now?
As an aside, I'm puzzled as to how Rokas, who claims to have studied BJJ and judo to "improve aikido", seems to only discover the action-reaction principle now that he's done the wrestling video with Oliver Enkamp. That's the whole point of judo, it's in the name of the art, FFS. This is telling.