I guess if oil consumption does improve after running the restore for a while, then you can safely assume that while the engine looked really clean, the rings didn't stay particularly clean with the conventional oil.
If it makes no difference...then it will be inconclusive whether synthetic oil would have reduced wear of rings or valve guides or anything that could cause oil usage.
My family had a 2010 Taurus that went 240k miles on 3k conventional oil changes, 99% highway driving. When the water pump failed ($3000 repair), it got sold to a tech that I'm friends with, and he fixed it. The timing chains were completely worn out and ready to jump. The engine was clean as new inside, which makes me wonder if synthetic oil at slightly longer intervals would have helped the chains to last a reasonable time.
One person on here said I should be happy with 240k miles out of the chains, but considering it was all easy highway driving, it shouldn't have worn out that fast.