Far more Jadgpanthers were used on the eastern front then the western one. It makes more sense for Ostheer when they already have a TD hole.
Actually, use of Jagdpanthers were sporadic, varying per source. The one i found mentioned many of them participated in the Ardennes of the Battle of the Bulge.
I personally am tired of super tanks. They only cause imbalance and are boring to use. They are also the laziest approach to problems and are only liked like a desire, despite suffering constant mechanical issues.
Regardless, if Ostheer actually gets a working TD stug, then it wont need to rely on a doctrinal TD.