I can't provide a citation for holding the pending subs at the table until the required sub has reported, but I can give a reason why this might be a good idea:
Say A6 is waiting to sub in for A1, who is their best FT shooter. B3 is required to be replaced and while you are waiting, you beckon in A6. B-HC does not make the substitution in the required time, and you must assess a TF. A-HC wants A1 to shoot the FTs, but now he can't enter until he sits a tick.
By holding the sub, you give A-HC more options on who can shoot the FTs.
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