The key point is that, just as it is the activation of parts of the system network that specifies the output at the level of meaning (i.e., the selection expression), it is the activation of some of the realisation rules that specify the structural outputs from the grammar. It is the realisation rules — together with the 'potential structures', a concept that we shall meet in Section 9.[2].2 of Chapter 9 — that specify the structures, and that therefore constitute the 'form potential' in the grammar.
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This continues the discussion of Figure 4 (p36):
As even the term 'realisation rule' itself discloses, this misconstrues a realisation relation as an instantiation relation between potential and instance.
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