فَهُمَا مُتَلَازِمَانِ
Thus advancing and delaying are inseparably linked.
When one constituent is placed before another, the second necessarily comes later. A rhetorical reason for the first element’s advancement therefore often explains the other’s delay.
For example, in iyyaka na‘budu the advance of iyyaka and delay of na‘budu are two descriptions of one arrangement. Its exclusivity depends on the relationship between them.
This does not mean every element may be moved freely. Grammar first determines what is permissible; rhetoric then explains the choice among valid arrangements.