Nice try, but it just won't fly.
The Sox went from 108-54 in 2018 to 84-78 in 2019 to 24-36 in 2020. From that great 2018 team they lost or traded the entire outfield of Beni, JBJ, and Mookie and one of the best in MLB whose combined WAR was 16.9 (!!!!!), a pretty decent 1b combo of Moreland and Pearce (combined WAR 2.1), starters Price and Porcello (WAR's of 4.4 and 3.1), closer Kimbrel (WAR 2.3), starter Wright (1.7), and reliever Joe Kelly.
Bloom did keep Bogey, Devers, and JDM--and catcher Vazquez, but brought in or up a whole new outfield, first baseman, second baseman, three new starters (Perez, Richards, and Pivetta) whom no one else particularly wanted, and assorted relievers while keeping relievers Barnes and Brasier and starters Eovaldi and ERod--the latter having missed all of 2020 from covid and cardiomyelitis. Oh, and Sale was expected to return at some point, which turned out to be soon enough for 9 starts and 42.2 innings and a WAR of 1.0.
Any sensible appraisal of the 2021 Sox had to conclude it was a rebuilding year and not as good as the 84-78 Sox of 2019, which not only retained most of the 2018 team, but included a much-improved ERod and much-improved Devers.
That the Sox finished with 92 wins and then beat the Yankees and Cole in the wild card game and the AL best team Rays in the ALDS was an astounding accomplishment and completely unexpected.
And let's be fair. As always, the players get the lion's share of the credit. Bloom and Cora threw no pitches, swung no bats, and fielded nothing.
Nevertheless, it is abundantly clear Cora knew the right buttons to push, especially with respect to the pitching staff. Richards, for example, came in as a starter, was emasculated by not being allowed to doctor up his knuckle curve, became unreliable, then became a great, if short-lived, reliever, only in the end to be not good enough to make the ALDS roster. Perez followed a similar route. Eovaldi stayed good, but was definitely helped when Cora made Plawecki his regular catcher. Sale came back wonderfully until the wheels came off in October--except for his final game when he looked pretty darn good. Barnes was the world's greatest closer for the first half of the season, but got so bad he wasn't on the the postseason roster. Indeed, just about every single reliever--Ottavino, Brasier, DHernandez, Robles, Perez, et was inconsistent. The exception was Whitlock--until he gave up that hugely damaging dinger in the 8th inning of game 4 of the ALCS.
Indeed, during the second half of the season--and the postseason-- Cora brilliantly used five different pitchers--Valdez, Richards, Whitlock, Houck, and Pivetta--as long relievers to compensate for both weak starts and weak relievers.
He also had to "misuse" Kike, who had an amazing season, but, thanks to the abysmal situation at 2b, was forced to play there instead of CF where he was badly needed. Dalbec at first base was an error and strikeout machine for 2/3 of the season but finally showed some promise. Nevertheless, Cora correctly used Schwarber, a late addition, at 1b in the postseason, except when JDM was hurt.
In the final 10 days of the regular season, the Sox seemed to be out of it. They lost 3 straight at Fenway to the Yankees and 2 of 3 to the Orioles--and headed to the Nationals Ball Park with a real prospect of not making the postseason. The pitching was erratic and Cora couldn't use a DH. But the Sox swept the Nats in no small part because Cora played both Schwarber and JDM in all three games and somehow overcame the Sox somewhat erratic pitching. ERod and Houck both had good starts--5 innings each and 0 runs--but Ottavino, Barnes, Davis, et al tried to give the games back to the Nats. Then Sale bombed in game 3--2.1 innings, 2 runs--and Richards, who had been good earlier in relief, gave up 3 more runs.
The above is both too long and too short, but it's one shot at explaining why Cora is regarded by most knowledgeable Sox fans as having done an excellent job this year.