"TIME REVERSAL!!!"
The first time Rowan used a Time-related ability it was with a Berserker clone, and the aspect of Time he manipulated was unique to the clone alone. He had not affected the world in any manner except by digging through the past and the future of the clone.
He could not just do this with anyone, because as Rowan had come to realize, he was able to manipulate the future. After all, he had access to the Berserker Clone Soul Origin.
At this time he had not begun to investigate the reason why the Berserker Clone, something that he created without any thought behind it and was just a technique that he could cast billions of times in a single second if he wanted to was able to give birth to a Soul Origin.
Anyway this might have happened, it had given Rowan a great power at a moment's notice that had astonished even him. It was a shame he did not have a second Berserker Clone inside Trion, but he had other options.