SUB
If a shaft shears it normally damages the spline oring and then you will loose your engine oil. Most accessories use engine oil to lubricate the drive shafts.
I think not. Quill shafts aren't sealed, they only connect two shafts which have their own sealing arrangements. There is no reason for a quill shaft to cause a loss of engine oil when it shears, it is designed specifically NOT to cause secondary damage.