The reason I say silvering is because his sides look darker than his back, but it could just be the light
Lilac and dove both have two copies of the black gene. It's not known with 100% certainty whether or not the silvering was directly linked to black or just tended to piggy back black. But there's a good chance that he will one day start to silver if he's not already.
Both of my chocolate mottleds (black-eyed doves) are silvering already, while my self chocolate is keeping his color nicely so far