That`s a bit simplistic; battles were often so large and confused that they involved all the units deployed. I shall trawl through some of my sources to see if it can be objectively substantiated.
The problem is, that if Dr Bleckwenn started off from the standpoint that these units were specifically raised as `2nd Class troops`, he will be liable to skew all his observations to support that theory, which I do not accept, as ALL newly-raised troops are `not as good` in combat as veteran units, because they need time to come to maturity.
If they were raised at, or after, the outbreak of serious hostilities - and Prussia was in deep s**t from all sides, right from the outset, in the 7YW - their early service would have been hard. They would have been thrown in at the deep end very soon after formation. Scarcely the right climate in which to shine from day one. Even some of Friedrich`s veteran regiments nearly broke under the immense odds and hard campaigning.