I hope they keep Eavoldi as the third starter. That would mean that Porcello starts only one game, but Porcello can also pitch from the bullpen.
I was considering the idea of making Price the 4th guy in the rotation, behind the big 3 of Sale, Eavoldi, and Porcello. In this scenario, Price starts only one game in the ALCS. The problem with this idea: since the ALCS starts on Sat, Eavoldi would have to pitch on Sunday. I would rather give Eavoldi a few extra days of rest. By keeping Price as the #2, I'm also giving Porcello a little extra rest.
If Price sucks again, the Red Sox could start E-Rod in game 6 and move Price to the bullpen. With that said, I would make the move now. E-Rod would be my #2, followed by Eovaldi and Porcello; Price to the bullpen.