While the chance that DC voted for Mobian because he found out Mobian was mafia N0 is significantly greater than it being a random vote (gathered from the fact that if Mobian is mafia, mafia probably has some informative role, or otherwise randomly voted for DC for some other reason, this stuff gets complicated and can be dealt with at a later date), there's still a great chance that DC's vote was truly random. I personally wouldn't mind voting for Mobian, but be prepared to change your votes if the circumstances change.
So I'm not necessarily saying "Don't vote for him because GN voted for him", I'm more saying that due to Root, we have the option of preferencing our votes based on who we think is mafia from tells, rather than who we think is mafia based on what roles were used. The former option sparks more discussion which can help in the long run, while the latter is more of a guideline if we don't think of anything.