Suriel was the first Angel to be created and he shared a unique connection with Rowan, making him the Angel with the fastest rate of growth among all the rest. At this time, his powers were equivalent to a Dominator of the Third Great Circle.
This was the reason Rowan spoke of his pride for his child. With his current capabilities, Suriel was capable of quelling any acts of unrest that may occur inside the Divine Palace, he could even hold back Vraeger if he ever went rogue.
Rowan had collected all the Essence that the dragon stole from him, thereby making it impossible for him to grow at an accelerated pace once more. If Vraegar was to be used as a weapon, it must be done in a very controlled manner or the consequences may be dire.