I don't think muscle soreness means anything really. Often you'll find soreness after doing exercises in loaded stretched positions such as Romanian Deadlifts or Overhead Triceps extensions for example. Other times you can get a great pump on Middle Deltoids with Lateral Raises but no muscle soreness the following day.
Having no muscle soreness is actually a good thing. Nothing worse then wanting to hit the gym hard but you're still feeling sore from a day or two ago.
Just on the Lower, Inner Chest, I find that gets sore the following day after doing lots of bar dips (leaning forward). As I said above it's most likely due to being under load in a stretched position.