IMO the loney in this case is slightly underselling the difficulty of finding slightly above replacement players that are good enough to hang around until they are arbitration eligible or free agents. (i.e. guys you need to have playoff teams)
Harrison and Mercer aren't much more than replacement level. Walker was a good hitter though and batting in next to MVP era McCutchen helped him.
Which, I think goes to say that it will be hard to emulate the NH years because almost that entire run of competency was tied to McCutchen carrying the offense and the coaching staff being extremely creative and effective at run prevention. Hayes and Reynolds combined are not at the level of what McCutchen brought those years. Not to mention this combo of coaching staff and pitching staff are just flailing.
I think I just view the transition from rebuilding to competitive as longer, it's not like you flip a switch, or have a straight line upward momentum. Deciding to keep Reynolds and stop tanking might just be the first in a string of years where BC tries to feel this out. think like 2011-2012 pirate teams that flirted with .500 through July with guys like Kevin Correia and Jeff Karstens.
In the three wild card seasons:
Walker was worth 8.8 WAR
JHay was worth 7.4 WAR
Mercer was 4.0 WAR
That's 3/8th of your everyday starting lineup that you could count on producing a halfway decent season. I mean, its not that hard to find a flash in the pan that produces a 2 or 3 war season (think Newman 2019, jung ho, etc), but it is hard to find a guy that can consistently produce a halfway decent season on the cheap. We aren't signing a bunch of Jean Segura types, so we have to develop them internally. Like, we might sign one or two, but we aren't filling out half the roster with them.
The question is, how many of these guys they acquired are good enough to produce 7 WAR over three seasons? It's not that easy to find guys like that.