User blog comment:BROTHER BAN-KAI/513. The Dark Moon Stroke/@comment-1706259-20121024182505/@comment-1706259-20121025144742

Obviously Godisem but I am sure you noticed when he touched Juha fullbring like reiatsu was seen from Ichigo's arm. Thus, "In that case seems like fullbring did the trick" applies to that aspect of his power being used. It apparently didn't just build up his base strength as Ginjo implied.