- 1 Something is missing in that argument,
- 2 A unified theory,
- 3 His thoughts are scattered,
- 4 The theory is a mess/ all over the place
- 5 Everything fell into place.
- 6 I'm missing a piece of the puzzle.
- 7 How/where does this fit with what you were saying before?
- 8 His argument lacked coherence.
- 9 That story just doesn't hang together.