I see what you're saying and agree that the 'dig time' could perhaps be better spent elsewhere. but if I remember rightly (which isn't always the case) a lot of what has been found on Traprain Law in the past (not including silver things!) was left in situ for future arcahaeologists to look at). presumably they just want to check and see what's left, and whether any of it can be saved

Cheers
Andy S