Did he install it, have an issue, and then check it over, or did he look it over and find an issue before installing it? If he had it running, any number of things (mostly oil related) could have happened. Plus, crank walk is something that he could have easily checked 5 seconds BEFORE buying it.
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-if the 7-bolt was in good running condition, there is zero reason to put a 6-bolt in....sounds fishy.
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To me, the bigger head bolts alone are reason enough to switch to a 6-bolt. Add in the (even more important) bigger, stronger rods and rod bolts, and there you go.