Why can't you mix the old and the new?
Well that answer was given to us a long time ago.
I think we can look to Mark 2:22:
And no one pours new wine into old wineskins. If he does, the wine will burst the skins, and both the wine and the wineskins will be ruined. No, he pours new wine into new wineskins."
You wouldn't want that brand new wing to burst now would you?
Yeah that sound about right after all, many of this discussion become the equivalent of what could be considered a religious debate
Just kidding