Did you see the exploded pinion and gears? When I drain some really often used lower units I see metal particles( flour size ) and they are usually from the clutch dog.... normal. Apart from something really "exploding" in there which is rare I have never seen a pinion crack in half or otherwise. If so though you had to have some kind of hit to the prop and it should show on the prop, as in a chunk missing. If you did hit something that hard you would have definetely noticed it. E-mail me if you have more questions at
anujapt3@gmail.com 
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