Maybe they just unscrewed a bunch of light bulbs and brought them to the party.
If you read 8-bit theater, which was amazing, that's exactly what happened.
How did they appear at all? It was a prophesy, after all. They were prophesized to appear, so why the hell not teleport some orbs to them from a temple that just conveniently turned out to be the very first dungeon. It would have been much better if you grabbed the orbs when you grabbed the princess, to actually add one more to the like, 2 actual story quests rather than chase down an item.
I love how the entire strip ended up being a set up to punchline from like, the second comic. XD
>>> The crystals.
Fighter: Won it in a brawl.
Red Mage: Won it in a bet.
White Mage: Bought it on a flea market.
Black Mage: Created one through alchemy.
Thief: Stole it.
Black Belt: Got it from his grandpa (it has 4 stars on it).
>> The black orb glitters ominously... but nothing happens..
It is shown in Dissidia. (SPOILER)The Warrior of Light obtains his crystal in Dissidia and the game ends with the beginning of the original Final Fantasy. We must also assume that the Warrior of Light splits into four different bodies whilst approaching castle Cornelia.
It all makes sense now...
I always found that enormously clever, and Dissidia basically ties into FF1 lore.