Those have always been unanswered for me and i still question botteling preboiled water/sugar while its being racked into a botteling bucket even when stirred.If your confident in your priming sugar just add to the bottles. I was tring to think of a way to boil the water/sugar and evenley dividing it between bottles, but i do 2 gal batches so its more practical. skipping the racking to bottleing bucket seems like a step that could be eliminated for risk of oxidation,but i think its minimal and worth it to just rack it .You wont have a clear as a beer by stirring into primary and who knows if the sugar settles after 15 minutes as suggested for doing it this way. I had a green taste from dry priming at least thats what i thought that took 5+ weeks to conditon from, since then i just boil sugar/water and rack to a botteling bucket. Try it but i think i got some off tastes from dry priming that took long to mellow but could be wrong because they were my first few and have since learned a few other things that i could have done better, but i havent really been able to pin it on unboiled priming sugar.