So then why does Luke constantly reference Joseph and him being of the House of David and of David's Lineage and not Mary ? If it's so obvious then explain why both Luke 1 : 26 - 27 ( which I should add doesn't even reference Mary's name just that she was a virgin betrothed to Joseph of the House of David ) and then you have Luke 2 : 4 which again reference Joseph and how he is of the House of David. If the context is so clear that Luke's lineage and genealogy is of Mary's side and not Joseph then why does Luke on multiple occasions reference Joseph being of the house of David and not Mary at all ? Why is the Genealogy in Luke clearly starting Joseph and not Mary ?
The answer to your question is to view in the context of the time; Luke was adhering to tradition, in the examples you reference; it was tradition to recognize the man over the woman, at that time. In the applicable location (e.g. the reference to Nathan; Luke 3: 31-32), Mary is implied to be the bloodline connection to David; that's where Luke got radical for his time period; the prime factor is that Mary was Jewish; if either author wanted Mary excluded, than she would have been a gentile; Mary is the only connection to David for Jesus; in the context of scripture, you can say it was a little later in the Bible that Mary's bloodline traces back to David, through Nathan (e.g. in referencing Jesus in Revelation).
But why does Luke constantly give credence to Joseph being of the House of David if it was not important to the story ? I mean I could see Luke using Joseph over Mary if it's tradition... but why such emphasis on Joseph being of the House of David and of David's Lineage but not a damn thing of Mary at all ? I mean Luke could not even put Mary as a footnote in scripture how her lineage was of the House of David but go through multiple passages to say Joseph is of the David's Lineage when it lacks importance in context ? You don't have one single shred of scripture to prove that this was Mary's Genealogy in Luke... but there such is a whole heck of a lot to think this was talking about Joseph's line again.