1. On my steed (DHC-8 Q400 with Rockwell Collins HGS 4100) the angle between Aircraft reference and Flight path symbols has no definition or use. As flight path is IRS derived, flight path symbol shows flightpath relative to earth. Vertical angle between ac reference (pitch) and flight path is roughly equal to AoA on aeroplanes with wing incidence angles close to zero and when there are
no significant vertical air currents (updrafts or downdrafts).
2. Yup, you can say so. If flightpath and pitch symbol line-up, aeroplane is flying where the nose is pointing (relative to earth). It's hard to achieve it in normal flight, though. All the aeroplanes I've flown have cruised with some positive pitch.