I get what you are saying... but I don't really see the need to spend anything to upgrade the bottom pair, if you push the rest down.
OEL + Timmins -> 6 goals for, 4 against, 57.5% Corsi, 50.9% Shots For
McCabe + Timmins -> 4 goals for, 2 against, 64% Corsi for, 61% Shots for.
McCabe + Benoit -> 8 goals for, 5 against, The shots for, and Corsi aren't good.
Both OEL and McCabe have been good with Tanev, but in any case if you do this.
OEL/McCabe Tanev
OEL/McCabe Timmins
We've got two pairings that have been effective, quite effective actually.
Benoit as #7 is pretty good.
The bottom line is also that we need a 3C, and to trade for a 3C, and two RD's, is likely beyond our resources.