The advancement rule is super cash. DG have so many short range units that can and need to run and gun; Blight Launchers Plague Marine squads, Bloat Drones and PBCs with Spitters, Foul Blight Spawns. Any Poxwalker squads need a good advance roll to get up in the game.
Wouldn't bother with two though. I had one with a Fugaris Helm for 10" aura in my last tourney (4-1) but even a 7" is enough. Bear in mind you can advance everything around him, then advance the NB himself to move his aura onto other units before they move. This is good for keeping explosion prone Blight Drones and PBCs on the flanks outside 7" from your chars and Plague Marines etc. Consider you next turn when moving him of course for what's going to start off within his aura again.
The morale effect isn't a reason to take him at all, rarely comes into play, and his actual damage dealing ability is crap. But he's not there for damage, he's there to ensure your Foul Blightspawn can reach out and touch a unit 20" away.
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