Yes. Don't get me wrong, he is (still) a very good player though. Where he has been missed most is ironically as a threat in the other penalty area. His departure and subsequent signing of Antony Kay (who was/is not the same kind of player for both better and worse) has been cited in my view wrongly as one of the main reasons for Bury being in the current situation.
The shortcomings in the current squad are obvious but I don't really think the centre of defence as a whole is on that list. Purely hypothetically, if I could have any player back from last season, it would be Chris Hussey. Some posters on here derided him as only being good for set pieces... and that is precisely where Bury have had not even a hint of consistent quality in 2016/2017.