Yes. Due to a VERY recent statute ( § 19.2-271.6 ), Chris's attorney is allowed to present his conditions as a mitigating factor. This overrules a particularly harsh law passed in 1980 that banned the use of mental health conditions as evidence. This evidence, however, might not be helpful in determining guilt in a case where intent is not an issue. It would still definitely help in presenting a more sympathetic viewpoint to the court, and that could carry over into sentencing instead of having to be introduced at the last minute for a diminshed capacity determination.
In addition, another recent statute ( § 19.2-303.6 ) would actually allow Chris to be let off entirely with a deferred disposition, though the fact that Chris has been in jail this long indicates that this may not be in the cards. (In addition, certain sexual crimes are not eligible for this. Sexual intercourse with your mother is not one of them, but cunnilingus with your mother is. The way it's worded, however, seems like it only applies on a second offense. Someone with actual Virginia legal chops could clarify this.)
Neither of these, however, are get-out-of-jail-free "tard cards". Firstly, they would have to convince a judge (in a bench trial) or jury (in a jury trial) that they applied.
Second, deferred disposition is not an acquittal. It means "Guilty if you mess up your probation, no charges if you succeed." He would still have to stay out of trouble for a long probation period, otherwise he would be hit with a conviction.
So yes, it's possible for the "teflon tard" to skate on this, but the fact that they are keeping him in jail makes it seem unlikely, and even if he does, he still would have spent at least a year in jail, despite never being convicted.