I apologize if there's an obvious answer here I'm missing, but I can't figure out why this line from De Bello Gallico 5.33 is subjunctive: "At Cotta, qui cogitasset haec posse in itinere accidere atque ob eam causam profectionis auctor non fuisset..."
Is fuisset subjunctive in an indirect question, or is this subjunctive in a causal clause describing a motivation of someone other than the speaker/writer?
Thank you!