We can't say for certain as of it, but it would certainly appear so. Jacob seemed to know what was going to happen and he put events in motion to get Sayid to the temple. By meeting Hurley ahead of time, giving him the guitar case with the ankh and message, Jacob apparently knew that he was going to die. So I suspect that Jacob is using Sayid's body just as the 'Man in Black' is using Locke's form as the loophole. It seems to be a game the two of them play. Now the question is where is home for the man in black, is it off island, is it the temple and why Jacob keeping him prisoner?