I think there seems to be some misconception that Virgin are only taking on low cost Captains. I attended an interview last year and not one of us there that day worked for Easy or Ryan, nor where any of us Captains. I also know of several people who have recently been hired with varying backgrounds and experience.
I don't know what it is they look for on a C.V or indeed what makes some stand out from the others. However they certainly don't seem to be taking any one specific group. So if you are interested in working for them just keep applying and hopefully your time will come.