I picture what we saw Thursday and will continue to see as a combination of "let's use the first weeks to find out what we've got," and a best guess at what has a chance of working. Topa coming in when he did, despite a rough spring, is an example. Sands warming up and being held in reserve and then not used once the lead was gone is another.
The risk is that every member of the bullpen is not quite up to the role they are assigned. Funderburk didn't get the lefty out to start an inning, for example, and it snowballed. But it's not just matchups. A Duran would bump everyone down one slot and they might do better; a Jax in addition would bump everyone down two. It's water under the bridge of course but not having replacements for those two, plus trading away the best candidate to plug in for them, is the cause of the trouble with this part of the roster. Talent is the issue, until we have evidence it's not, and strategy can only go so far.