In DGSD, XZ, with virtually no skills of his own, had 3 experts pass on their inner power to him. So such a thing is possible.
So theoretically, XZ or DY at their death beds, should be able to pass on all their accumulated inner power to a designated heir. This heir would presumably receive the inner power of 3 Elders plus any that XZ might have accumulated in his lifetime. And that heir on his death bed would be able to pass on the power of 3 Elders, XZ, and his own to the next heir.
Would there be any logical limit to how much inner power could be obtained in this fashion given enough generations?