Wow thanks for the replies and feedback on this one. It is not very often a technician is willing to reinstall a faulty component to grab additional waveforms, and for this we are most grateful, thank you.
Thank you to Autonerdz too as you cannot argue with the wiring diagram, not a capacitor in sight, sorry.
I compared the peak current with a Saab waveform I have here and they are not too far apart. I have included the SAAB waveform below which is the only major automotive manufacturer to have utilised CDI in such volume. Now Saab are no longer, I don't know who is using CDI to great effect?
What is the small event that can be seen prior to the discharge?
This is called the "Polarity Peak", and seen as the magnetic flux builds at the start of the saturation/dwell period.
Does this event align with the commencement of the "IGT" signal (Igniter trigger "On" point.) The commencement of current flow into the primary?