 Re: that, which or nothing
Nothing to do with "far past" or "ordinary past" - where did you get that from? It's just sequencing. When two events occur in sequence, regardless of whether they're past, present or future, a perfect verb can always be used to make the sequence explicit. If the sequence is indicated in another way (by the adverb, context etc) the use of the perfect verb is optional. If it's not, then the perfect becomes obligatory. |