That's what I would have thought, but he got some ink on mlb.com simply for throwing strikes. Cooper seems disgusted with all of the walks.
If you look at the actual stats, though, the walks are not very evenly distributed. McLemore with 10 (possibly sealing his fate, imo), Randolph & Runelvys with 6 (perhaps the veterans Coop was referring to?) and Paulino & Wright with 5 (two guys in their first ST that Coop was excusing) account for 32 of the 56 (or was it 58?) total.
You're right, though, that Cassell is probably moving up the ladder with his command.