Link received from the dragons—mostly from the queen—dragon power, the book Dragon, various dragon spells, and alchemy. He'd lost the thin piece of time but shared a way to create extraordinary material with the queen.
All in all, he didn't lose anything.
But at the end, he forced himself to stay there and let the Red Dragon Queen seal his dragon form. Thinking back, he'd been too headstrong. His dragon form was so useful. It was a pity to lose it like this.
Whatever. What's done is done. No point in regret. Link, look forward! Comforting himself, Link walked into his room at the top of the Mage Tower.
Celine happened to be in that room. She flipped through Link's enchantment book while one slender hand was open on the table. A small Mithril ball hovered above her palm. Under the modification force field, the ball kept changing shape.
She was practicing enchantments.