I've had similar damage to what you have there, on a few tomatoes this year. I don't know if it's thrips or stinkbugs or what, but I had an orange tomato similar to your yellow one. Lots of corking and rough skin on the top half especially. It took forever to ripen, and when it did, it tasted terrible. A later tomato from the same plant was much better tasting.
The second picture looks like some kind of growth aberration during early pollination or fruit development when the seeds are not totally enclosed by the fruit. I have seen fruit in which a crevice of dry dark fiberous material with undeveloped seeds is visible. I haven't seen one quite as large as yours. I would cut off that section, and the other half should be fine. You might as well peel the yellow and taste it before discarding.
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Dee
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