Question: Why does Stryker believe the adamantium bonding process won't work on Sabertooth? Him and Wolverine are brothers and so have the same abilities so it should definitely work.
Answer: Sabretooth's healing powers have always been inferior to Wolverines. Since Wolverine technically did die for a minute during the surgery, Sabretooth's chances of surviving are slim. Also, Stryker wanted to use Sabretooth to capture the other mutants; in return, he would give him the surgery. It is plausible to think he had no intention of giving him the bonding surgery and was lying to further his own agenda.
Answer: I think they have both been tested and Stryker found out that Sabertooth's healing factor is inferior to that of Wolverine.
lionhead