Nick – Think you may have nailed it. The maps and documents all pointing to Muscoota with Mosholu being a derivation or mistaken spelling of it all seems to fit. I’ve seem long held beliefs on the origin of my own last name being proven wrong with further research and using maps at that. Way to go Nick, nice work and research ‘connecting the dots’ on the origin of Mosholu.
Regarding naming of Fort Independence Ave in Spuyten Duyvil. It does go back to the misplacement of two Ft Independence’s on the British 1776 map. Another reason though for the two Fort Independence’s is the confusion on which hill it was located. Tetard’s Hill or Tippett’s Hill, both of which the Americans built forts.