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Ptolemy, yes you certainly need go back read my post.
I have been around turbo charging for a very long time but never came upon a turbo geared to the crankshaft turbo compounding or not, turbo compounding is not permitted.
The MGU-H (heat) which is driving or being driven by the turbo shaft can act as a motor to spool up the turbo shaft as well as act as a generator to either charge the batteries or deliver a charge to the MGU-K (kinetic) which is geared to the engine crankshaft.