Talking about all those systems where the supercharger is not clutched and where the throttle is in the inherently safe position upstream of the supercharger.
A roots blower does not consume much power when it runs in a manifold pressure that is typical at closed throttle.
The bypass valve synchronisation problem does not exist if the blower is not clutched and there is no bypass.
The bent throttle shaft problem does not exist if the throttle is upstream.
I can understand OEM investing huge resources and going to all the trouble to squeeze some extra power out of a restricted space and still retain reasonable economy, but a hot rodder chasing maximum power is really wasting a lot of time and effort and really decreasing safety to save a minimal amount of fuel.
To be frank I really can' be bothered contributing to this.
I also noticed the vast majority of real professional knowledgeable full time working professional engine designers  are not bothering with this thread. You might ask why.
original position was that the OP was acting on a false premise and based on that false premise was wasting his time for little gain at great cost in time, materials and risk.
Remove the throttle blades from the manifold downstream of the blower, add a throttle body before the blower and forget about bypass valves.
You will have a drivable high performance car with no detectable or significant response or fuel economy difference long before you could make the balance valve work better than an upstream throttle.

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