People are seriously going with A?
Treave already stated that there is a chance for great glory with B, which means that if we play our cards right we will be able to prevent a considerable amount or all of the damage even with the delay. Going with B will also keep us from appearing like the massive assholes we would appear to be in A and keep us from pissing off the chain of command, which has the added bonus of us getting useful support in actually stopping this gigantic structure.
A could save more people, maybe, depending on how things turn out, but aside from that variable it appears to be generally worse.
Here's the thing, B doesn't play to Senya's strengths. So far, we've built up a character who's brilliant at tactics, improvisation and guerrilla warfare and all of these things will be best utilized in A. Think Ean during his assassination campaign to regain power: quick, cunning and creative, but not so good on the raw power aspect, hence his need to maneuver and improvise; I'm just thinking that going B here will end up like going to Egypt dd in chapter five: we waste valuable time that could be spent setting up Marduk in Greece (or in our case, scouting and setting up the battlefield for Hackett's Fifth Fleet
); and we finally arrive at Olympus, we won't have the brute force to beat down both Marduk and Zeus, so we will have to compromise and come up with shit at the last possible second and out come the Terrasphagos (or in our case, muscle through two fleets' worth of firepower to
somehow take down a twenty kilometer space station). Because, like Ean, right now we have all the smarts and improvisation skills we need. What we don't have is brute force.
You could, but why would anyone listen? I mean, you're demanding an enemy faction reroute their entire escort based on the fact that you think they're going too close. In times of war. That might be a bit unreasonable.
Being proved right after the fact might be little consolation. Or did you think they won't do it if someone calls them out on it, or if they might look like the bad guys?
As I see it, it's not about the enemy so much as it is for "I told you so" when everyone and their grandma will think of giving us flack in regards to this whole operation. That, and for Rei: I can't imagine she'll be personally comfortable with her big brother (Imouto means little sister, right?) calling out her side in a live broadcast across the whole world, maybe will even inspire even more turmoil and hand-wringing within her (side note: and here I thought
Senya was a deluded fool living in a glass world), making her easier to convert. Although this is a longshot and assumptions.
That and Shulgi Prime's approval.