Nope, you can get those skill through the Solaris training and Family training as well as just buying them with your left over points - just have some sort of reasonable explanation. This is why I like the paths - they really aren't a straight jacket, they just give flavor.
All in all, Piloting 3, Gunnery 4 (to give a typical 4/5 regular pilot) costs you 200 pts. Fields are cheaper but not the only way, they just round out the character. O0
- Shane