lately WTI has trailed Brent by a pretty wide margin, as much as almost $4 for a brief time. This is VERY significant.

Yes, it is significant, but what does it really mean? My take is that it reflects the premium for tanker delivery as opposed to Cushing delivery. That Asian refiner is not exactly at the end of the NA pipeline system.

it reflects a heavily contangoed market. Nobody really needs prompt wti and storage is full. The fear factor is boosting later delivery and more so in Europe as Iranian crude is actually refined there in a significant amount.