Question

Because of the new gym leaders in black and white and because the trio have been lost are they the shadow triad.

Answer 1

No they are not the shadow triad and they are not lost.In Black 2 & White 2, the sriaton city gym has been converted into a restaurant where battles with the trio Gym Leaders can take daily.
The shadow triad,you can find them in icirrus city and battle them.

In short:They are not the shadow triad.As far as i know good persons dont be evil.