When an engine has been diagnosed with blowby, technician B is only correct who states that the compression rings could be worn.
Engine blowby happens when a mixture of combustion gases or air-fuel leaks between the pistons and cylinder wall into the crankcase of the engine because of the lose pistons's rings. Engine blowby can occur within both gas and diesel engines. Minor levels of engine blowby are normal but excessive levels of engine blowby are an indicator of larger issues. So technician B says correctly.
While technician A is not right to say that a cracked flywheel could be a reason for the blowby engine.
You can learn more about engine blowby at
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