The Ultimate Black Mage Resources with Damage Calculator

[Adamantium]

Actually, it's not. His has nothing to do with whether or not the bolt has hit (and the bolt hitting is NOT what triggers it showing a firestarter proc, as proven by the fact that we don't get them instantly when we're at point blank range).

All spells take the same time to hit no matter what range you're at, and the bolt hitting is what triggers Firestarter.

Edit: This weaving concept is a bit similar to how many other skills will have their effects applied instantly(at least visually) when you use another skill immediately after it. When you use a Firestarter proc immediately after casting Fire 1, your Fire essentially hits immediately along with Firestarter. Weaving just expands this idea and tries to weave in other off-GCDs in an attempt to get Firestarter procs to show up faster, react to those procs, and munch less of them as a result. I, personally, would not go through all that trouble for something that would likely be a minor DPS increase.