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The chain looks dry in the photo. Rollers are not sealed by the O-rings like the pins are, so lack of lube could have contributed to the failure. But still, it seems the roller probably had a manufacturing defect. Some chains have rollers that are bent around and have an unwelded seam. Motorcycle chains shouldn't be made that way, but some might be. Can you find unwelded seams on the other rollers?
It's hard to believe the sprockets need to be replaced after 4,500 miles, but maybe if they were run dry that whole time they have excessive wear.
What brand of chain is that (the original one)?
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