Thanks for sharing the video with us.
While watching, I was talking out, predicting the piles you would/should put together. I haven't played with Gifts Ungiven in a long time except for a stint where I played a Thought-Knot Seer Gifts Ungiven deck not long ago. It had more deterministic Gifts piles though as it sought to assemble Vault/Key and not lethal Tendrils of Agony piles. It's an incredibly complicated card that rewards very sharp play and a keen knowledge of one's deck and board state. I had forgotten how difficult of a card it is. I do miss the days of Fact or Fiction and Gifts Ungiven piles.
I found myself thinking out different lines than you did. Would they have changed the outcome of the game? No idea. I recall playing Gifts in its heyday and remember committing several piles to memory for common game states. A common one that I don't recall you talking out is the triple tutor and flashback spell pile (MT, VT, DT, Snap) during an end step Gifts in search of Yawgmoth's Will.