It would really help your case if you stopped including crap like what I bolded here.
And honestly, you have provided no evidence for your opinions either so although you are right to redirect this discussion to the realm of data and evidence, don't pretend like you've been providing first-rate analysis.
First of all SF and DET had exactly league average pitching last year by ERA+, so idk why you refer to those two clubs as if we couldn't possibly pull that off. Lets refer to Baltimore, number 5 last year with an ERA+ of 114 as something to strive for.
The bottom 3-6 in the Orioles rotation was comprised of Kevin Gausman, Miguel Gonzalez, Ubaldo Jimenez, and Bud Norris who had FIPs of 3.41, 4.89, 4.67, and 4.22 respectively. Gausman performed well after being called up as a highly touted prospect, not unlike Owens or Rodriguez very well may do this year. Gonzalez was a pretty terrible pitcher who severely outperformed his peripherals to an ERA of 3.23 (FIP 4.89) (although maybe there's something to that as he's done it for three years now). Jimenez performed poorly, but was depended upon down the stretch even on a playoff team like Baltimore. Bud Norris found career lows in the triple / line against, WHIP, TB, babip etc. at the age of 29. None of them had more than 165 IP. This team was 5th in all of the MLB by ERA+, and their top of Tillman and Chen were not Lester caliber. In fact they both pitched very similarly to James Shields, who is very likely to land here as a number two behind a Hamels or Lester.
The bar is simply not as high as you think. Yes Buchholz is unpredictable and fragile like Jimenez, yes Kelly is more like a #4 unless he figures things out like Norris and yes, the 5/6 spots are going to be unproven prospects, maybe some damn good ones who could replicate the 113 IP at 3.6 ERA that Gausman if things go right. But Boston has the means to put two aces atop a 3-6 that I think compares pretty well to the 3-6 on the team that was 5th in ERA+ in 2014.