Hola Mberme..estava esperando que alguien hiciera esta observacion!

I was just waiting for
someone to make this observation... the problem is of course that a 2 servo elevon controlled airplane is vulnerable in this way, and adding a 4 servo set seems to be a good idea at first, but it is not.
It is almost impossible to control a roo or a HS with just a elevon and a half, in case of a single servo failure in a set of 4 with split elevons..and now you just have more components to fail,
more current consumption, weight and complexity.
This vulnerability is fixed only in one way IMO, adding a conventional elevator or canards.
And about that crash, is always a good idea to check things with great care, specially after a rough landing...
Saludos, Enrique