To bid that smart-contracts builders/users will feel more secure if the oracle run on PoW instead of PoS is farfetch at best.
Past =/= future
The point of the Oracle problem is to send the *truth*, there is no such things as valuable or non valuable truth.
Before you can give a value to a SC, it needs to execute correctly and to do so need to receive the truth.
Doesn't matter if you are the first if your assumptions are incorrect in the first place.