Yep, the strength gains are just so excessive and are really being caused just by the interaction of Tren with your muscles and as that interaction is cut off(Tren is out of the system) you lose a lot of that excess strength....
And as for a major advantage of Tren that no other roid has is its nutrient partitioning effect on the body. Shuttles more of your food for use into the body. Makes your body a lot more efficient with your food and any vitamins and minerals you ingest.