The General did not hide the fact that he had possessed the body of the soldier, Alec Rhines, he saw no need to. His orders would be obeyed more quickly and efficiently if they knew who he was.
In his extremely weakened state, all of these soldiers were his most precious resources, and in his eyes, they were just extra lives, but with each death, his bloodline identity gets more diluted, and he would likely fail his resurrection if he did this one more time.
With the destruction of the Nexus, he became aware after a while that Rowan should have left, or else he knew he would be dead by now. Not foolish enough to look the gift horse in the mouth, he proceeded to gather the soldiers and any remnants inside the Nexus, and he came upon a startling find.
At this time, he had finished gathering all the people left inside the Nexus and was busy examining the remnants of the shedding left behind by Rowan Dragons.