... We should see if we can invent some weapons system which would take the Ninja-Radar Rune's outputs (locations of all ninja within 10 miles) and automatically initiate strikes on those locations.
An automatic RER targeting setup is the minimal viable product. It would greatly decrease the number of RERs we'll need for striking O'Uzu: the difference between "saturation bombing" and "precision bombing". In addition, it would likely ensure that nobody would be able to escape, or remain unnoticed: we wouldn't rely on Team Uplift's faulty senses that can't even see through e. g. forest canopy, we would rely on chakra-based targeting (which may be downright
impossible to spoof).
If we can make the control-system feedback loops tight enough (i. e., the speed with which the system changes targeting solutions in response to the targets' movement), this should even take care of Akatsuki members flying up to us.
This setup would
also then continuously keep us safe from any Akatsuki members attempting to launch a counterattack while we're doing whatever it is we're doing with the rift. If they manage to escape the initial strike, they wouldn't be able to return without risking being instagibbed:
- The weapon sees chakra, which they may not be able to suppress at all.
- Even if they have an esoteric invisibility-in-the-chakra-spectrum technique, they wouldn't immediately know that this weapon works this way. They may not want to risk it.
- The weapon would have a very wide AoE, likely way beyond even Akatsuki members' attack range (since they're at the mercy of the chakra diffusion principle to a much greater extent than runes).
I would argue that a sufficiently scaled version of
this may in fact be sufficient to give us O'Uzu, even if it has two (non-Konan) Akatsuki there. And I think we can be tentatively optimistic that neither Kisame nor Itachi's crows would be able to see 10 miles up, so we may be able to afford the lengthy process of assembling this right on top of O'Uzu. (Sufficiently fast-firing RERs might even be able to take Konan out, though I by-default expect that she's too multitudious for that.)
Also, one neglected option: even if our weapons have 1-mile range, we can
assemble our weapons on a skytower 10-20 miles up, then just... let it slowly drift down over the course of days, and activate it once the ground is within range. Under some setups, this might work.
Though, of course, it's an open question regarding whether we
can scale it enough. This would require:
- The Ninja-Radar Rune, specifically one that can refresh its readings at combat speeds.
- A "control system" rune/seal array, which interfaces with the Ninja-Radar Rune and controls Remote Explosive Runes.
- Remote Explosive Runes that fire faster and have a greater range (though not necessarily 10 miles).
The main unknown here is (2). This can of course be split into several seals/runes: an element that takes readings from the Ninja-Radar Rune and transforms them into targeting solutions, an element that rotates RERs, an element that activates RERs. I think there's a decent chance all of those may be "easy".
The next potential problem is (1): does the default NRR operate at combat speeds? If no, how hard is it to improve? Perhaps at the cost of range?
The last problem is how far we can actually scale RERs.