Houck and Whitlock will reach their innings pitched limits for this year, unless they start pitching too poorly to earn them. It's not a bad idea to spread out those innings by placing them in the situations they are most likely to succeed and possibly having some innings left for the end of the season and maybe even a playoff series or two. BTW, Whitlock is just 1/3 of an inning from leading the Sox pen in IP, this season:
11.2 Andriese
11.1 Whitlock
11.0 Barnes
Houck will get his chance, for sure, but we really needed to see what Richards, Pivetta and Perez could give us, and 3-4 starts each is not really enough to pull the plug on anyone, especially when all 3 of them have shown signs of being decent to good.
Yes, Cordero and Renfroe have obviously been playing very poorly, but again, it's not even the end of the first month. Do you really think plugs should be pulled over sample sizes under 50 PAs? Just look at some of some recent Sox players extended slumps. JBJ is the classic example, but look at JD's 60 game sample size,last year. I could find dozens and dozens of cases where pulling the plug would have been an awful idea. The second part is for whom? If Duran was hitting .875 in AAA after a month or tow and was showing he was okay on defense, maybe, but the kid isn't even playing live ball, right now, and hasn't since ST'ing.
When Duran is ready, he'll get his shot. If Cordero & Renfore keep playing like this for another 3-4 weeks, which to me is not likely, then maybe we look elsewhere, and my bte is they give Marwin the first chance to win the LF role, then maybe Chavis or Puello. Again, I'm not down on Duran, but it is very likely not "his time" this early in the season.