Roman reigns title defences

Was thinking back at Romans three and a half year reign and we know the Usos and Solo interfered in many matches but got me thinking Why didn't heyman ever interfere? Only one i can think of is royal rumble when he turned on Brock but apart from that i don't think he ever got involved it would have been in my mind at least better if in some matches he got involved instead of the bloodline like Dragging the ref out of the ring or the opponent. The bloodline interference just got a little stale and would have liked to have seen something different.