No.....

With collocate you put a maximum of 1 node on 1 tape, so A is not possible,
the 5th node does not have a scratchtape to use.
With collocate every node have's a own set of tape(s), so you need less
mounts when you restore, so the restores are faster. However, the migration
and reclamation takes more time and it takes more tapes. With 12 nodes,
you've got at leased 12 tapes 'filling'.

Greetings,
   Maurice van 't Loo
   The Netherlands