I may be wrong, but I don't think the 40 is a problem. I count 41 now including Volquez and Bray. Volquez is already on the 60 DL and I would expect Bray will be also. That leaves one opening before they need to DFA someone. A problem would occur only if they decided to add both Leake and Lehr.
http://reds.mlb.com/team/roster_40man.jsp?c_id=cin
Damn, it would be fun to be a fly on the wall in the meetings. There are so many dimensions to consider....putting best team on the field based on spring showing, contracts and FA, giving the benefit of a doubt to veterans who have not had a good spring, trying to work a trade rather than releasing a player.......