Ah-ha. A beautiful lie springs to mind - if Ryoval expects the incineration of his samples to cover a specific theft, perhaps he was dealing with Bharaputra for a copy of something or other - can't be Asterion, surely Ryoval has noticed by now that Miles walked out with him, the freezer would do nothing to cover that -

"I was wondering when you'd begin to realize. You gave your brother the motive, in assassinating his life extension plan. And you asked too much of Bharaputra, so they provided the method, planting the super-soldier in your facility where I could rendezvous with him - although unlike the city of Troy, you paid good money for your wooden horse. I admit, I wasn't expecting your security fellows to lock us unsupervised in a basement together. That was a godsend. It would have taken me, oh, hours longer to pull off the mission if I'd had to search him out unaided." He smiles, studies his fingernails for a moment, then glances up at the vid pickup through demurely lowered lashes and adds, "I supplied the master plan myself, of course."