I suppose if that makes sense for you, go ahead and do it that way, but it's not how I see the energy operating in candle spellcraft. One can claim that "sealing the power" is very undesirable, as it locks it away and keeps it from going anywhere in the world. One can also claim the power manifest in the spell is making waves while the candle is burning, making the method of extinguishing irrelevant. Others I've seen claim that you don't blow them out because it offends the Fire Spirits. Plus about half a dozen other explanations. All of them make metaphysical claims that can't be proven correct or incorrect; 'tis probably why it's best for us to use what works for ourselves.