If you'd care to provide a hint of evidence or scientific theory towards your assumptions then I'd be happy to have a sensible debate with you. Until that point, I see precious little point in arguing the toss with someone who sits there with blinkers on assuming that, because they've been fine running mis-matched tyres, then it must be fine. It's a shame you've had to rape the OP's thread to try and point-score against me.
Why do you need to know the history of the tyres anyway? If they've got tread and no repairs or dodgy marks, then what's the worst that could be wrong with them? Honestly, it's as if you're trying to make yourself sound like an idiot.
And I'm still waiting for you to find me saying previously that partworns are bad. OH LOOK YOU CAN'T