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The Guardian saw ferrous metal only, and the size was rather small, as is usually the case with ferrous debris in these engines.
Cam deviation values can be seen at any time the engine is running if you have the right scan tool. Normal values are +/- 6 degrees. In the early stages of IMS failure, the deviation values swing wildly back and forth, and at higher values, indicating that the VarioCam system is losing control of the cam timing because the IMS shaft if moving, causing the long chains to go slack.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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