So, where do we go from here? What can we do?
Not much, sadly.
If Steven's alive, I'm afraid Rolf's death might deter him from returning home (guilt)?
If he's not alive, it's obvious he's not where anyone's looked.
If someone harmed him, it'll take a break in the case.
If he harmed himself, he was very good at hiding it.
Right now, we have to give the family some space.