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I already shot my own idea down, the only energy recoverable is miniscule in most cases due to the way Roots blowers are built.
I know no work is performed on the throttle body, the point is that there is an energy loss due to free expansion at the throttle body in the typical case. Cylinders drawing air unevenly reduces this slightly. As I wrote, a Roots blower would suffer nearly the same magnitude of loss to free expansion while having additional inefficiencies, thus it's not a good idea. I was mistaken in thinking it would recover significant energy because that energy would come from the pistons pulling a deeper vacuum.
And again, if the Roots blower exit was coupled more or less directly to the intake valves then it would be a different story but that's very difficult to do.
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