Actually the way it's worded supercharge works on a single wild talent meaning blast, infusion, or utility wild talents. Because gather power specifically says blast wild talent then supercharge changes it to single wild talent instead of blast wild talent. It's not a miss type is an expansion of the power. Changing the way gather power works from blast wild talent to now single wild talent.
Because gather power does not say "single blast wild talent" it just says "blast wild talent" then supercharge changes it to "single wild talent" if it was just for blasts they would have put "blast wild talent".
And also why just blasts in the first place? Why can't you use it to reduce any burn and metakinisis says you have to take the burn it does not say it adds to the blasts burn like it says in infusions.