Probably not, then again if it's on AFD it probably isn't uncontroversial.
There are plenty of uncontroversial AFDs. Yes, they probably should have gone through PROD instead, but they often go through AFD anyway.
When was it decided that non-admins can't close "controversial" AFDs?
When we it decided that they could? Wikipedia:Maintenance is not part of the deletion policy. http://en.wikipedia.org/wiki/Wikipedia:Guide_to_deletion#Closure calls the volunteer that closes the AFD the "closing admin" and makes no reference to non-admins closing AFDs. It is generally accepted that an admin isn't required for almost unanimous keeps, but I don't know of any consensus for any other AFDs to be closed by non-admins.