ORIGINAL: Schmart
The timing of equipment changes was meant to shine light on the WITE process, where the change in equipment isn't always in one fell swoop, whereas historically a new Bn (or Bn worth of tanks) generally arrived all at once, or the Div was sent to France to refit.
Historically new equipment didn't arrive all at once whether the unit was sent to e.g. France to refit or not.
The Totenkopf received it's first 4 Panthers in January 1944, it then received 6 in March, 5 in June, and then 77 in July 1944 but these arrived throughout the month in deliveries of 8,2,2,1,8,8,8,8,8,8,5,5,2,4, of which 5 were exchanged and re-issued to I./Pz Regt 16 and 4 were handed over from I./ Pz Regt 27. The Panther battalion was then sent to the eastern front at the end of July 1944 a full 6 months after receiving it's first Panther delivery and this is just one example.