This doesn't solve the plot problem of "I have five minutes to think, command and execute all this reaction that people are talking about in the most perfect manner possible, as if there aren't any other engagements occurring elsewhere"
If there's enough time to break off the Hood and Serkr team from whatever they're doing, there's enough time to break the Imperieuse off from doing absolutely nothing. Also, unless Steele is a complete moron he probably realized that there was some chance the Agincourt was headed for a jump gate, even if he had no way of knowing which one. He had a couple weeks to put together a plan for that contingency.
But he
did. He placed the Serkr and the Hood in front of the jump gate waiting for the Agincourt.
This ought to be enough. No one anticipated the BeamzJam. Only after that point should you count the seconds for a comeback being thought and executed. And within those seconds you should also count the seconds of confusion among the Serkr Team of what the hell happened + communication with Steele + "WTF happened u Serkr idiots?" + "We're still trying to understand" + "It appears we are being jammed sir", "WTF how is that F possible?!?" + "No clue sir" + "Ok, LET ME THINK FOR A SECOND"
Losing the AWACS is not a mission-ending scenario. Dying is a mission-ending scenario. There is no canonical information as to whether or not the AWACS survived. There is canonical information as to whether or not Laporte survived. Debating what might have been a good idea if the AWACS had been destroyed is therefore pertinent. Debating what might have been a good idea if Laporte had died is therefore impertinent.
When the AWACS get the chance of being destroyed, isn't the wargods team all over the Hood anyway? Or can that event occur before the Serkr team goes away? If so, we could be seing a slight plot hole. But it's almost in the realm of nitpicking very specific chain of events.
Ignoring again the fact that the Toutatis was engaged elsewhere and was not able to extricate herself until several minutes after the Medea was destroyed.
If the situation was that bad, they could come sooner. It was a matter of priorities, and the admiral figured that a small support would cover the Medea situation and he could come a little later to the field. The possibility of flanking the Imperieuse is, I think, high on his priorities.
The Toutatis was also engaged during Delenda Est, and did not break off to flank and destroy the Imperieuse when she showed up then.
The Toutatis was already calculating its attack on the Hood but not Saturn. But that's a good point.
And ignoring again the fact that the Imperieuse had a full air wing and the Toutatis was empty.
I'm really not that much impressed by this, since waves of wings still take their time to launch, and in less than a minute of back and forth, the Toutatis really kicks the Imperieuse to the ground. The waves may do a good damage to the T, even bring it down, but at the cost of a good destroyer. If the T jumps into the Imp's broadside, it's game over for the Imp.
Now I don't remember the fiction, so I don't know what the excuse for the T not showing up in DE was. Probably the excuse was the same one as the Imp's in Aristea: too risky. Yes, they would probably kill the Imp, but they would take a lot of damage as well.