Another request for the sagely advice here.

Firstly, have booked the family trip TLV-EWR using a mixed bag of tricks to get the best value thanks to your suggestions.

Anyway on the final leg - LHR-TLV - Mrs. Irubi & baby are in FIRST on an Onbusiness reward booking. My son & I are on a Club World revenue booking and GUF2 voucher.
We are still in Club World as I am told that there is no availability in FIRST for miles redemptions for that flight.

The strange thing is that, as Mrs Irubi is in FIRST, I can see the seatmap. Apart from one other person, the cabin is EMPTY??????? CW cabin is also nearly empty.
Now, I know my wife is Onbusiness, so not miles redemptions.
Also, Seatcounter shows a wide open flight.

Does anyone know the logic behind this (if any exists) and is there anything I can get to get us all in FIRST together as we have "paid" for it?????

Thanks,

Irubi