I have limited insights into Accenture Strategy Germany, mostly based on discussions with a friend back at Business School, but it still might be relevant for you, so here we go:
1) Accenture Strategy is (trying to be) not Accenture but a semi-independent strategy house. Thus, they are trying to tap into the same candidate pool as most strategy consultancies.
2) Based on my experience, the salaries you quote would be somewhat halfway in between Big4 management consulting and strategy consulting (both at Big4 i.e. Strategy&, Parthenon, Tier2 and MBB). This would fit to a similar business positioning in between strategy and management consulting. It also fits to what I know from my friend. So, yes, the salaries you quote, should be correct.
3) With regards to positioning... well in my experience these rankings are not necessarily describing the market fully. Read up on the metric they use (if published) and you may find , that they are usually either very "soft" (e.g. based on interviews with selected managers/ purchasers in industry) or based on limited information (e.g. on estimated/ non-published or outdated revenues). Moreover, it really depends how you define the market for "Consultancies". Are you talking Strategy, Management, Technology, Business Process Outsourcing?
4) With regards to exit opportunities, I cannot contribute.
Hope my remarks help you to clarify some of your questions.