Supposing that he did agree, it would still follow that Dmitri Karamazov is the murderer and the instigator, and Smerdyakov is only a passive accomplice, and not even an accomplice, but merely acquiesced against his will through terror.
"But perhaps it was not a case of active complicity on Smerdyakov’s part, but only of passive acquiescence; perhaps Smerdyakov was intimidated and agreed not to prevent the murder, and foreseeing that he would be blamed for letting his master be murdered, without screaming for help or resisting, he may have obtained permission from Dmitri Karamazov to get out of the way by shamming a fit—’you may murder him as you like; it’s nothing to me.’
There are no more uses of "acquiesce" in the book.
Show samples from other sources
She is opposed, but will ultimately acquiesce to the will of the majority.
You can make them acquiesce, but don’t expect them to be happy about it.