Yes. The sin of the highest angel was the cause of the others sinning because it did not compel them but rather induced them by a kind of exhortation.
Although the demons all sinned in the one instant, yet the sin of one could be the cause of the rest sinning. For the angel needs no delay of time for choice, exhortation, or consent, as man, who requires deliberation in order to choose and consent, and vocal speech in order to exhort; both of which are the work of time.