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You can't tell from that picture, the damage could have been sustained from the cowling. There is speculation that the damage is from a fan blade but that has not been determined yet. The video of the engine doesn't show any corresponding damage on the side where any fan blade could have exited either.

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That's fair. I assume the logic here is that a dislodged cowling or other external engine paneling is traveling at a relatively low velocity when it makes contact with another part of the plane, compared to a fan blade which, if successfully ejected from the engine casing, would be traveling at a very high speed?

Cowling is not designed to hold the fan blades. There is a brown kevlar sheet around the fan that keeps the shrapnel in

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