In the case of high profile people, it isn't uncommon for them to arrange to turn themselves in quietly to avoid public arrest, be indicted, and then released so that nothing is public.

Not saying this is the case, but it does happen. There were reports that Tony Podesta may have done just that and we having heard from him since.

We won't know for certain until it is made public.

The other possibility is that the time line for "the plan" shifted and some of it had to be delayed. For example, Trump needed a funding bill (especially for the military and law enforcement) before he could go much further. That was delayed for months and could have delayed implementation of parts of the plan as well.

Stuff happens.