Staying on Eppler (5 of the 8 you list are Dipoto signings), Canning (2017 draft) was a good draft pick and maybe Aaron Hernandez (2018 draft) will develop into a quality starting pitcher. Sandoval and Buttrey were good trades.
I could argue Eppler wifted in the 2016 draft on pitching choosing Thaiss and Noni Willams in 1st and 3rd rounds over say Dakota Hudson or Shane Bieber, but if CRod and/or Jose Soriano (signed by Eppler in March of 2016) develop into solid mid-rotation plus pitchers, it would make the draft/signings a strong one. Could be even better draft if Thaiss develops into solid 1B and Marsh as solid OF.
It's too early to judge 2017, 18 and 19 drafts for pitching. If Jack Kochanowicz develops into top of rotation arm, that alone would legitimize 2019 draft.