Linking the PNRs means that either both or neither will clear. However, this still does not mean that the seats will be together. You could both get upgraded and get not-together seats. If you end up with one window and one aisle, it's usually very easy to get one of the other folks to move..because it's to a like seat.

As for your chances, we'll have to rely on HNL's Up-Check(tm) for the prediction.

Cheers.