earlier Swedish independence

During the 1400s Karl Knutsson Bonde was an on-again off-again king of Sweden (and briefly Norway) but Erik of Pommerania (also king of Denmark and Norway) eventually succeeded in consolidating power and Sweden would remain as a part of the Kalmar union until Gustav I (for the most part)

But what if Karl Knutsson Bonde remained as king of Sweden and Sweden remained independent?
 
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