Also with regards to them not having enough corvettes to crush the wargods AND maintain the tie-down, I'm willing to bet the Imperieuse is worth the firepower of quite a few corvettes. If the Imperieuse was put into play instead of an equivalent number of corvettes then the wargods would have been just as dead if the freed up corvettes were sent into Delenda Est. All the GTVA needs to do is replace a large group of corvettes that are engaged with a solaris battlegroup.
This is exactly my point. The wargods had to wait until the rest of the GTVA fleet was tied down, in the case of DE, all the corvette assets with the exception of Lopez's battle group. If the Imperiuse had been used INSTEAD of those corvettes, so that a corvette pack would be used to hunt the wargods, what would the UEF have done?
They'd have seen a destroyer they were sure wasn't in system, fully engaged (albeit not against the Wargods), which, unless Calder is criminally stupid, should be a sign that everything is not as it seems and there is likely a nasty trap in the works. I.e., it's time to bail. The wargods attack likely never would have been launched, and the rest of the fleet would have backed off ASAP.
Edit -
The only way, (in my opinion) that the Imperiuse could have been freed up to fight something else, as well as using Corvettes to hit the wargods means the Imperiuse has to be used as an ambush vessel as it was against the wargods, because as I saidearlier, if it's there at the beginning of the engagement, it will spook the UEF and the entire operation will hit "it's time to get the hell out of dodge" mode.
I don't disagree that the Imperiuse was overkill, it definitely was. But I don't think that the GTVA had enough assets to use anything else. If these corvettes were flagged for the ambush, something would have had to deal with the ships they actually did deal with, and that something would have had to be the Imperiuse. If nothing was doing their tie down job from the beginning, then UEF assets would have been able to bumrush some sad sorry ship with all their frigates that weren't engaged.