From the question given here: Who is the Vaishya Rishi Sankila?, It is evident that true vedic kshatriyas must have a three-rishi (pravara) "Manava, Aida, Paururavasa" for the Hotri, followed by their gOtra. Vaisyas must have the following: three-rishi (pravara) "Bhalandana, Vatsapra, Mankila" for the Hotri, followed by the gOtra of their priest. This is according to the Boudhayana Dharma Sutras as documented in above question.
My questions are:
1) How does this pravara cover the suryavamsha? Pururavas is the progenitor of the chandravamsha (discussed here: How are the lunar race and solar race originated? )
2) Should those claiming to be vaisyas and kshatriyas be reciting those respective pravarAs when doing abhivAdaye (if at all any such kshatriyAs and vaisyAs exist)?
3) So Kshatriyas and Vaisyas need not worry about sagOtra marriages as long as the prescribed 7 paternal generations have passed? (ref to the 7 generation rule: If sagotra mariages are prohibited, why did Krishna marry Satyabhama?) Per question discussed above, it seems their gotras can change according to the current purOhit of their family.