Of those names the only real surprises to me are Duke Welker and Victor Black. Not because they were sent down, but because it happened so early.
Welker and Black hardly pitched at all for the Pirates in Spring, throwing just 3.0 IP and 4.0 IP respectively. That indicates they were really never in the running to make the squad.
Pimentel and Strickland were never expected to make the team though both pitched well in their 3.2 and 4.0 IP.
I guess Jerry Sands and Clint Robinson going so soon could be seen as a bit of a surprise, but the Pirates are filled with players like them. Despite only a few at bats a piece neither had an OPS over .500 so they weren’t going to overtake anyone.
No surprise for Taillon. It’s just not time.
Erik Cordier is minor league depth. He only saw 0.2 IP in Spring, giving up a run on two hits.
Matt Hague is probably Minor League depth too, though he put together a decent line over 22 AB – .364/.391/.455. Don’t count Hague out though as a call up at some point. There is still some upside.
Hernandez is a 30 year old minor leaguer and Darren Ford is a 27 year old minor leaguer. Neither is likely to see substantial time with the big club.