Eickhoff was a 3 WAR pitcher in 2016. That's an anchor pitcher.
Those mythological #1 and #2s are rare, most good teams have one top starter, 1-2 middle guys who put up 2-3 WAR, and a bunch of guys filling out the back of the rotation.
Philly fans got skewed expectations from 2010-2011.
[ordered by number of starts]
2009: Hamels (1.9), Blanton (2.6), Moyer (0.3), Happ (4.2), Lee (1.1), Myers (0.5), Martinez (0.7) [820 runs]
2010: Halladay (8.3), Hamels (5.4), Kendrick (0.3), Blanton (-0.1), Moyer (0.2), Oswalt (3.3) [772 runs]
2011: Halladay (8.9), Lee (8.6), Hamels (6.6), Oswalt (2.2), Worley (3.4), Kendrick (1.8) [713 runs]
2012: Hamels (4.6), Lee (4.5), Halladay (0.9), Kendrick (1.5), Worley (0.9), Blanton (0.0) [684 runs]
2013: Hamels (4.6), Lee (7.3), Kendrick (1.0), Pettibone (1.5), Lannan (-0.2), Halladay (-1.4), Cloyd (-1.3) [610 runs]
2014: Burnett (0.1), Kendrick (0.4), Hamels (6.6), Buchanan (1.4), Hernandez (1.3), Lee (0.8) [619 runs]
2015: Harang (0.7), Williams (-0.8), Hamels (2.7), Buchanan (-1.3), Morgan (0.9), Nola (1.9), O'Sullivan (-0.4), Eickhoff (1.8) [626 runs]
2016: Eickhoff (3.5), Hellickson (2.9), Velasquez (1.7), Morgan (-1.0), Nola (0.0), Eflin (-0.2), Thompson (-0.1) [610 runs]
2017: Nola (4.5), Pivetta (-0.3), Eickhoff (0.7), Hellickson (1.1), Lively (1.2), Velasquez (0.4), Eflin (-0.3), Leiter (-0.1) [690 runs]
Pitching is so erratic that I'd focus on the offense and the bullpen, then starting pitching.
If you can score 750+ runs and have a deep bullpen, you can win without great pitching