After meeting Brock and finding out who he is, or who he was as well, Sam had his suspicions that the Blade family would be involved in all of this somehow. Due to Brock working at the Balde family. The fact that he was using some sort of disguise and how long he had to have been there for it just made sense.
Richard Eno, just didn't seem like the type of person to do things on the whim. Everything he did, everything that happened was done with caution. In a way, it reminded Sam a little of himself, but the difference was, while Sam was playing chess with one opponent, it felt like Richard Eno was playing with four at the same time, and each one of the moves he made was intertwined with the others.
