I am very unconvinced that record in close games is something that should all or even mostly ascribed to the manager. It's primarily luck/variance and what isn't variance is mostly bullpen. Craig Counsell had six relievers with an ERA under 3.5 this year, including three guys with an ERA under 2. David Ross...did not have that to put it lightly. So like blaming the Cubs record on Patrick Wisdom bunting or whatever the perceived slight of the day is misses the forest for the trees pretty badly.
That said, David Ross wasn't perfect and some of the things Counsell does helps him make his own luck. Ross's circle of trust was surprisingly hard to penetrate. Julian Merryweather, after his disaster first outing of the year, was clearly in the doghouse. He only had 2 high leverage outings in April/May, and the second of those was May 30th. So it took 2 months for Ross to give Merryweather the rock when it mattered even as the bullpen was immolating in May. Watching from afar, the Brewers Counsell appears to make those changes in weeks, not months.
For another example look at Abner Uribe. He is remarkably similar to Daniel Palencia. Whether In terms of the quality of the stuff (140 Stuff+ for Palencia, 139 for Uribe), the spottiness of the command (15.7% walk rate for Uribe, 11.8% for Palencia), or the timeline (Palencia debuted very memorably on July 4th, Uribe was a few days later on July 8th) the guys are very similar. Yet Uribe was part of the late inning rotation for Counsell while Palencia was very much a "if I have to" option for Ross.
There's another thing Counsell does that I think helps his cause, but the fans are going to horsefeathering HATE it. Counsell is more willing than most managers to punt games that are not totally out of reach. He's not bringing his setup man into a game his team is losing 5-3 in the 9th. He's going to like the 6th or 7th guy on the totem pole and hoping for the best. Cubs fans (Matt Clapp on Twitter being the most notable in my experience) throw coniptions when Ross does the same (or when he doesn't bring a guy in for the 3rd day in a row, but don't get me started on how that dumb horsefeathers is).
I'm excited for Counsell, he's currently the best around, but Ross was fine. Counsell will make a number of different decisions that give the Cubs a 60/40 edge over more of a 50/50 one, but that's going to ultimately be like maybe 2-3 wins.