Nah, I wouldn't chalk it up to early lock up. I'd say it's far more likely that this guy either bent his lock bar off camera, or he damaged it previously by performing his all important spine whack tests.
If you want a folding knife that you can spine whack to your heart's content, go for one of those tri-ad locks that everyone is swearing by nowadays. Personally, I'd prefer knives that I can blow clean with just a strong puff. I've had two lock backs fail on me due to excess detritus in the lock mechanism, and although they were fine after I cleaned them out, those experiences have scared me a bit.
No, I don't plan on spine whacking anything. Also I would have expected Chris Reeve Knives to have been able to determine if the lock was bent during warranty. Sorry you weren't able to tell that your lock-backs' had debris in them. Usually that means the lock bar is proud of the liners near the tang and low in the release relief. The tang notch on a lock-back is available for you to "puff" and so is the lock bar. But I'm glad that you agree a locking folder should have a strong lock.