The 4000 and 5000 have similar sidewalls and I expect about the same vulnerability. I really try not to hit the sides of sharp rocks about the size of golf balls. I'll use both until my 4000's run out. Our tandem came with Gatorskins. I took them off after the first couple of rides. Incredibly slow tires.
I've had sidewalls cut like in the first photo on several tire brands, but never saw or heard about anything like the second photo - other than on the web of course. Ah, of course: brake pads were set too high, wore through. Rim probably had a wobble in it. That's the reason I've never seen anything like it.
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