For what it's worth, Steamer has the following 2019 projections for Red Sox starters:
Chris Sale, 32 GS, 202 IP, 2.76 ERA, 6.6 WAR
David Price, 32 GS, 194 IP, 3.94 ERA, 3.5 WAR
Nathan Eovaldi, 29 GS, 152 IP, 3.89 ERA, 2.8 WAR
Rick Porcello, 32 GS, 191 IP, 4.24 ERA, 2.6 WAR
Eduardo Rodriguez, 19 GS, 136 IP, 4.02 ERA, 1.9 WAR
https://www.fangraphs.com/projections.aspx?pos=all&stats=pit&type=steamer&team=0&lg=all&players=0&sort=19,d