All this is just speculation, but I would still expect Breen to drive the Puma for the 1st time after Finland as well. However we haven't seen his contract and it might not be as watertight as full time drivers contracts can be. Is he on a pay-per-event deal or a yearly contract?
I think Malcolm let Ogier have a run in the C3 while he was under contract at Msport iirc (although that was probably with the hope Ogier would be put off by the C3).
If Msport will be running the Puma in Greece after the Acropolis, maybe Adamo has just taken the view of what difference does it really make if he let's Breen drive the car? Breen is going there anyway and will test the car soon enough regardless, and it's not like Breen is NOT going to be fully motivated to end his Hyundai career on a high in Finland. If Adamo was pissed at his elite drivers Tanak or Neuville leaving to Msport, maybe he would block a test in that case, but Breen? That's a bit different.

