Noah was described as having three attributes by God:
“… Noah was a righteous man, blameless in his generation. Noah walked with God.”
Moreover a few thousand years later his reputation was in tact:
“even if these three men, Noah, Daniel, and Job, were in it, they would deliver but their own lives by their righteousness, declares the Lord God.”
‘Righteous, blameless, and walked with God’ … Noah was as pure a human as was possible and worthy to pass on his genetics to all mankind.
Lord take me when I am used up, but use me until I am taken.