Hope you don't mind a post from the 'old' country...
Ref runway state:
Is this ever a consideration in Crash investigations?
Can't speak for Canada, but in the UK, it's certainly on page one of the AAIB's list. Reports into recent over-runs at UK airports have included their views on the state of the runway at the time.
One of our first actions, after we've rescued all the pax & crew and secured the scene, would be to carry out a full-length friction measurement; in fact we wouldn't be allowed to re-open the runway, even with re-declared distances, until we are satisfied it's up to standard. Ideally we would want to carry out the inspection in the same conditions as for the accident, so ASAP.
Cheers,
The Odd One