1- yes of course
2 - no - as EY marketed
3 - you can credit all EY operated flights but the AF and LH one will not credit.
4 - I would not put a FF flyer for the whole itinerary if you do not have status and then would retroclaim all EY flights to VA. The EY codeshares on AF and LH, do a retroclaim on EY.
Remember to make sure to keep all boarding passes.