I just changed my clutch myself a couple weeks ago, and I can see how the TO bearing could rattle in some situations. However, I don't see how it would rattle on decel with the clutch fully engaged. I think it rattles quite a bit with the clutch disengaged.

 

Alright, that does make sense to me now that I think about it... I would just find it hard to believe that it could be the source of the deceleration buzz/rattle