Sorry, nalan? Also, that brings another question to the table. How does szeth fule nightblood?
Back on topic, honorblades aren't more powerful in terms of the physical world, because Gavilar fought szeth blade on blade. And thrugh that exchange we know that all shardblades, living or dead, are on equill footing with honorblades.
I personally think that nightblood would make the shardblade leave the physical world and return to the cognitive, requiring a constant resomaning. following thoes rules bonded spren in blade form would vanish, the nahale bond broken.