Well, no, the arguments are still important whether or not we can reach a definitive conclusion, because they inform what "keep watching" means. If there is a s

Well, no, the arguments are still important whether or not we can reach a definitive conclusion, because they inform what "keep watching" means. If there is a stronger consensus that it's an outgassing comet, then money/time/resources will be invested in looking for evidence of that. Likewise, of the consensus is that it's a probe, those same resources will be invested differently. This is actually Avi's argument for considering the probe hypothesis. He's not trying to prove it was a probe, he's making a case for investing resources into experiments that could detect probes and industrialized alien civilizations, as opposed to detecting new classes of comets.