From what he can tell of Saleh, he seems naive for wanting to see the good in people and not suspecting ill-intent. From the V-day event, he might think him to be a little stiff as a conversationalist. XD

On occasion, he remembers feeling something for Saleh, but it's more confusing than it is strong; his residual feelings for Hector have more of an effect on him. Isaac doesn't exactly trust this guy, but that goes with anyone, really.