"For instance, why would anyone included in that passage (the elect) need Purgatory?"
1 Corinthians 3:15
If someone’s work is burned up, he will suffer loss. He himself will be saved, but only as through fire.Matthew 5:26
I tell you the truth, you will never get out of there until you have paid the last penny!
Clearly indicates a soul going "somewhere" where there is obvious suffering and punishment, but not eternally: Christ clearly indicates that he will be released when his base, unworthy works are "burned up" or when he "pays the last penny".
I guess Jesus thought it was worth repeating:
Luke 12:59
I tell you, you will not get out of there until you have paid the very last cent!”
All as He foreknows, of course.
Oh boy