I have seen Tazawa once this year, and in his two outings he has had good location, movement, and velocity. Padilla also looked pretty good at one point. I hope he works out well, but I am reserving judgement on him until I see more of him.
As for Valentine having to leave Doubront in the game because he doesn't trust his pen to hold an eight run lead, thats pretty sad. I can't think of any other reason to leave him in there at 99 pitches with the season so young. Doubront is probably not going to toss 200 innings, or even 180this year. Its his first year as a SP in the majors, and these kinds of guys are usually limited in terms of how many innings he can pitch. I think it was perfectly reasonable to turn it over to the pen....except that our pen isn't reasonable.