Yes, human sentience has a value, in and of itself. This is why the person with severe retardation issues might not have as many freedoms as a 'healthy' person, but certainly retains more rights than most animals with similar cognitive capacities.
But to point out that fetuses have an 'inherent capacity for intelligence', and therefore deserve protections, is creates a weird philosophical concern. Bread has an inherent capacity for intelligence, because if you convert the calories in bread through a human digestive system, a decent proportion of those carbon atoms become integrated into a thinking, sentient system.
It is true that depending on our mental competence, the rights and privileges we have will vary (as evidenced by laws on motor vehicle operation, marriage, military service, etc...). However, it cannot be used in a context which entails certain moral conclusions, as it engages in an equivocation between positive rights and natural rights. Positive rights have to do with legal issues, which are distinct from moral issues.
Bread does not have the capacity to develop intelligence, only to be part of it's process. You're confusing yourself.