Because of this combination of skills / perks
[u]Arcane spirt +divine order[/u] : this combination gives you 80-90% of the bar filled in both armor and recovery( reduses agility to about 15-20%
[u]energy drain[/u]: normally only reduses your grenade cool down but is augmented by other abilities.
[u]Embrace the void[/u]: where it starts to get fun. Damaging enemy's with your grenade / nova bomb triggers energy drain
[u]life steal[/u] killing a enemy while energy drain is active restores a " significant portion " if your health.
[u]the hunger [/u] extends the duration of energy drain
With these abilities you should be able to tank very well
-
Well there wont be any tanking to do in the game but as far as damage mitigation you're definately right sunsingers will be able to get the same as defenders that way.