Stories aren't static, especially a serialized and collaborative format like TV.
Kripke's initial plan with spn was Sam was to be the chosen one hero, the Luke Skywalker, and Dean was going to be a sidekick, the muscle, who looks after the chosen one, and be brash and charming, the Han Solo.
As early as season one, that plan, that formula, started to change. And eventually Dean's plot role too. spn made its Han Solo into a chosen one hero too. The show evolved each season. It didn't stay the same as it was in season one. Characters and relationships evolved, new characters came in. The scope of the show grew, literally on a cosmic level.
In season 4, Cas got introduced. He was expected to stay 3 episodes. Instead he stayed forever and he became Dean's person. The creatives in S4 had no idea of the lightning they'd just harnessed, with Cas as a character, or Destiel. There was no deliberate creative intent with Destiel in S4 (which doesn't mean no one was thinking about it, but any early subtext isn't the same thing as what it became later).
The story went on. The story evolved, the creative process evolved. Writing and creative process is often an act of discovery. Writers don't know everything about their characters when they set out to tell a story, they discover things along the way.
The story grew. Cas grew. Dean grew. The creatives began to deliberately lean into Destiel, the actors, being artists and creators too, also leaned in.
Dean having his own chosen one role in the mytharc wasn't part of the original plan. Cas--having angels at all--wasn't part of the original plan. Destiel wasn't part of the original plan.
There's many things that weren't part of the original plan but they are canon, they are part of the weave, part of the story.
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