"But couldn't the objects be created or formed with the atoms already somewhat stable?"
I'm not sure what this means.
if you mean to ask whether lead 206 is present in specific ratios according to depth or otherwise indicated age of a Uranium containing rock the answer is no, which is why the clocks are useful and indicate age. If they didn't, they would bare no correlation with the geological record. [to my knowledge lead 206 also exists exclusively as a product of fissile decay]
Whose that guy angry with you? lol, Hey, just dropping you a message. You need a proper visit from someone that isn't put off by someone else being different. So, what's up? Let me know if you need something and want to chat.