I'll guarantee you 10lb fluoro will not get a DD crankbait as deep as 10 lb braid. I do agree that braid for deep cranking is no good, though. Fluoro doesn't get deeper than mono because it sinks, either. If that were the sole reason, 20lb fluoro would get deeper than 10 pound fluoro because it's heavier and would sink faster than the 10lb. Fluoro gets deeper than mono because it is of smaller diameter than a similar pound test of mono. It's all about line diameter and resistance when you want to get a crankbait as deep as it will go on long casts.
"Things turn out best for those who make the best of the way things turn out" - Zachary Troy Schrah - a young man with vision far beyond his years.