Is Roy's dad able to get into the LG heaven?

[Keltest]

Letting a non-Good person into LG heaven because the system failed to judge their most recent actions is a non-just act, which is not Good.

I think youre missing my point here. How is it the fault of the deva's if they are not omniscient? If they cant foresee every single contingency in the history of existence that has been or will be.