From what I can gather, he's concentrating on the Madeleine investigation and - for the moment - doesn't have any particular reason to think that she may have been an accomplice.
Sandra seems to be coming at it from a different angle: exploring a variety of crimes that took place around that time (most of which don't seem to have been thoroughly investigated - my view) and trying to see if there are any connections.
I agree with that, Carana.
Two different approaches to the same end I think. Both are professional investigators but perhaps with slightly different priorities. Sandra Felgueiras has to use facts to make hers as interesting a story as possible while Hans Christian Wolters uses unembellished facts to gather evidence which will stand the test in court.
I like Sandra's style and think she may be able to egg the pudding in a way which would be superfluous for Hans Christian's purpose.
I think Sandra is bravely putting everything on the line in the interest of JUSTICE. It amazes me that people who have paid lip service to the notion for many years have so much negativity regarding those who in one way or another are attempting to deliver it based on facts and evidence.
Takes all kinds I suppose.