I've always thought of Purgatory as a way for God, in His Mercy, to allow us time to get right with Him, after our deaths, in order to be able to see Him in all his Glory. Some of us had done more wrong in our lives than others, but not egregious evil, and may need more time in Purgatory, in order to be able to cleanse ourselves to withstand the brilliance of God's Presence.
Mother Angelica described it once like a mudroom of Heaven where we must wash off our earthly sins before we are allowed in. Nothing unpure is allowed in Heaven. I have my doubts that teddy made it even to Purgatory, judging from his letter to the Pope he was trying to sell himself not confess his sins IMHO.