I think El P just has the days and rotation a little confused (or the sportswire probable pitchers did). Arrieta would pitch Sunday on four days rest (Pivetta pitches Friday and Nola pitches Saturday, both on five days rest). But yes, given his performance (and age) a spot start or bullpen game would still be best I think. Which is to say, you're trying to beat the Braves and Arrieta isn't necessarily the best option (and Eflin's not available).
I think the bullpen game is probably the way to go (do the opener and also bring back Irvin, whose 10 days will be up by then. Both VV and Eickhoff himself could be in the middle inning mix).
Davis down and Ramos up today. If Morgan could be back Friday that would be really helpful.