I note that the 300 points that Shikamaru and company aim to score in this round do not, in point of fact, guarantee them progression to the finals.
The active members in R2 are red. R2 Blue is reactive. Consider the agency of R2 red.
The other R2 red candidates generally start R2 with -225 pts (or -300 pts for Kurenai/Cloud/Downfall), whereas ISC/co get 300 in the ideal world.
This is a 525/600 pt spread.
ISC/co members can take -495 next round, while their other R2 red members can feasibly get 185, though intentional penalties narrow that gap.
Postulate a super team red that specifically targets ISC/co so as to eliminate the concept of Leaf alliance/superiority in this exam
Teams with ISC in R2 self-sacrifice: -495 pts
Teams against Goketsu self sacrifice to other blue teams: -495 pls
Each other team: 185 - 110= 75 assume 2 ISC-co per red group
A spread of 570 in round 2 for 14 members (2 red groups - 4 ISC-co) against ISC, and a spread of 185 against ISC-co.
All told, this results in a net gain (45 pt) over ISC for some folk, a net loss to ISC (30 pt) if Kurenai/Downfall/Cloud, and a net loss against ISC-co of 340 pts. ISC-co we're described as lowest quartile, so I predict this shift only puts them on par with the previous top scorers. As ISC was purposefully not the top scorer, +\- 50 pts probably shifts up and down rankings substantially.
Additionally, the plan calls for 22 prisoners, which can be given to one facility (say, the one ISC was supposed to fight, which gets a pass) to artificially boost their scores back into the running.
Without getting any prisoners, and most folks getting -225+75=-150, to our 235, Goketsu maybe lays in contention with the top scorers, but it is no guarantee that we proceed.
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The actions of an anti-ISC super team red and the actions of an anti-Goketsu super team red will look extremely similar to our allies during preparation.
During the initial staging, 27 injured ninja turn on 9 uninjured ninja in unprepared ground. ISC-co gets wiped.
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Instead, do not propose mass combat. Have ISC/co capture their respective squads at the outset of the 2 hr mark with goo-bombs, which allows us to collect everyone, then ISC+co uses our base as a staging ground for their rampage.