Bolton is getting older and is a bit torn up.
Benni, too, is getting a bit older, and has been getting his fair share of injures. Also, he's settling down, and not wanting to add bodyweight like when he was younger.
I don't think we'll see another relatively large jump in the deadlift for a while, and when we do, it will be on the strongman side. There are a number in the #900+ range, and bodywise, they've got the builds to add more size comfortably.