Check out Halliday & Hasan (1976) Cohesion in English for detailed discussion of substitution and ellipsis... very different explanation — as discourse semantic resources rather than grammatical constraints.
Blogger Comments:
This is misleading, because it is not true. Halliday & Hasan (1976) was concerned with lexicogrammatical cohesion, not discourse semantics. Martin (1992) took Halliday & Hasan (1976) as his source and rebranded their lexicogrammatical cohesion as his own discourse semantics. Here Rose is participating in that deception.
