A new set of tires after 43K

I have driven and enjoyed my reliable 72 z for many years since I bought her many years ago (still full stock).

About the same time of purchase I replaced the original oil filled shocks with KYB gas units, I replaced the second set of Bridgestone with Potenza in 2001.

Now, I have a new set of shoes far better than Bridgestone for my stock Z. It maybe a shame for some of you but they are BF Goodrich on the original steel rims. They are very comfortable and not distorted as the Potenza when new.

My question is:

-Rotation never done in 43k

-Front tires were worned even in front and still good.

-Rear tires were worned more inward (why I made the decision to replace the entire set),

-Suspension components thight with no play at all.

Conclusion:

Was it a weakness of the early Z to wear tires inboad because of the rear iindependent suspension geometry?