I have border collies. None of our dogs have ever been heal nippers, not even when we were kids and they all came from working lines but there are borders that do this although you see it less in crosses.

As for how the pup will turn out, thats total chance really. Borders aren't naturally as large as goldens so the offspring have a good chance of turning out a bit smaller than a pure golden. As for personality and drive, that could vary greatly among the siblings although, even in the most driven like the border, it will be diluted somewhat compared to a purebred border.