Would Blue-Eyes White Dragon, Lord of D., Flute of summoning dragon, etc. be good in a lightsworn deck?

No,none of those cards work in a Lightsworn deck,because their effect are for a deck of their own.Lightsworns focuse only on another Lightsworn(really selfish) and those cards would be in the Graveyard anyways,because of the effects of Lightsworns,ther cost is to sent a card(s) from the top of your deck to the Graveyard.But Lightsworns work well with Zombies,thought.