I certainly agree with your point that the timing remains up in the air. It's a quick order for a recall due to immediate safety concerns that would have been a problem. But we're at the point where the issue could be dismissed any day now. The close spacing of two non-injurious road debris incidents was apparently one of those statistical anomalies that occasionally occur. The NHTSA may have wanted to wait a few months to be sure that is the case. So most of their testing may have simply involved sitting around while following the news.
Meanwhile, my car will soon be recalled by GM for an ignition switch defect that has resulted in thirteen deaths. It is not an NHTSA mandated recall, despite the agency being made aware of the problem in 2007. If the NHTSA could ignore that GM situation, surely they won't flag Tesla over a couple of high-speed Model S accidents that resulted in no injuries.
Time for a model S Curt!