Yes these types of investigations usually follow a set pattern but I haven't really seen anything so far which leads me to believe Trump will be found guilty of any crimes. Certainly the report will be negative against him and probably reveal political sins and if we use the recent statements as an example imply wrong doing. But from all I've heard and seen no crimes will be revealed.
Most people don't understand the Plea deal system and how its not unusual for a witness to COMPOSE something to receive a plea deal or a more favorable plea deal. My take is Cohen composed for the deal. Cooperation can mean different things.
Something else many people don't know is there may be no public report of Muellers' findings? There will be a confidential report given to the AG who will then provide a report to Congress.
So what it looks like to me is Mueller knowing this is using a kind of back door approach to reveal certain things which have political purpose in his released statements.
So yes there are drips but they don't appear to be forming any pool of significant water.