Certainly, neglecting the rotation, especially after we knew Gio was toast, was the big blunder. (The Sale trade, to me, is only a blunder in hindsight, but let's not go there, again.)
We knew guys like Houck, Whitlock, Crawford and Bello could not be counted on for 175+ IP, and only Pivetta offered some hope for that total.
Criswell and Anderson? LOL!
It would have been way cheaper signing a 4/5 SP'ers than trying to trade for one, now, and it would have lessened the strain on the current rotation and pen by having someone eat 80-110 IP, up to now.
Somewhat amazingly many SP signings, even ten or more low to mid range ones, have produced, so far this season.
Upper-Mid Range:
$25M x 3 Sonny Gray (2.7 fWAR, 15th in MLB and better than Crawford)
Mid Level
$13M x 4 Imanaga (2.5 fWAR (19th in MLB
$15M x 3 Seth Lugo (3.2 fWAR is 9th)
$18M x 2 Stroman (0.0 fWAR but 110 more IP than Gio)
$16M x 2 Wacha (2.0 fWAR, 33rd in MLB- ahead of Crawford)
$14M x 2 Manaea (1.3 fWAR, 67th and just below Pivetta)
$14M x 1 Flaherty (2.3 fWAR, 23rd in MLB- ahead of Crawford)
$13M x 1 Severino (1.2 fWAR
$13M x 1 Gibson (1.2 fWAR)
$11M x 1 L Lynn (0.9 fWAR- same as Criswell)
Low/Mid Level:
$8M x 2 Fedde (2.6 fWAR, 17th and tied with Burnes)
$7M x 1 Paxton (0.3 and 89 IP)
$4.5 x 1 Lorenzen (1.7 fWAR and 97 IP)