Except google's idea wasn't "search engine". Google's idea was "search engine that uses the PageRank algorithm". PageRank did not encompass all of the value of Google, but it did encompass much of it, and it was unequivocally part of the idea.
What you're effectively saying is that ideas have no value without good execution, which is of course true, but this is very different than saying they have no value, because after all, execution has no value without a good idea.
EDIT: Oh I see what you mean now. By "you", you actually mean me. No, I couldn't, because Google has parlayed their initial good idea into a monopoly based on network effects, specifically the accrual of proprietary data (clicks) which I have no access to.
If the value is in the idea, then multiple execution of the same idea should result in the same/similar values.
But... this isn't true irl, therefore the differences in value isn't in the idea but the execution
What you're effectively saying is that ideas have no value without good execution, which is of course true, but this is very different than saying they have no value, because after all, execution has no value without a good idea.