Perhaps Gromit has become disillusioned with AB, as postings suggest that others have, and is laying 'dormant' until things improve.
At present I see AB as a site which has been taken over by long time serving members; some of whom are jack/jill of all trades but masters/mistresses of none. How often do we see replies along the lines of ......'I don't know the answer but feel sure that someone does'.