If Neville was the other possible candidate for the Prophecy:
- Did the Longbottoms / other members of the Order know of the Prophecy?
- Were the Longbottoms in hiding just like the Potters?
If it was just the Potters, can you explain why that is the case? Was it because Dumbledore/other members of the Order had an inkling that it would be Harry? If so, then the Order pretty much made the decision for Voldemort.