This is not the correct way to use CERA, either, but for those who think overall CERA tells a better story, consider these numbers over multiple seasons.
2014-2021 Red Sox pitchers with Vaz and back ups sorted by most IP with Sox since 2014 (all Sox pitchers with 280+ IP since 2014 w Sox):
CERA/OPS Against (IP)
Sale
2.51/.622 AJ P (226)
2.79/.578 Leon (436)
4.61/.762 Vaz (84)
(No catcher on the CWS had a CERA worse than 3.53)
ERod
3.78/.778 Hanigan (50)
4.05/.700 Leon (118)
4.23/.723 Vaz (566)
4.44/.692 Swihart (75)
Porcello
4.19/.728 Leon (576)
4.93/.800 Swihart (122)
4.96/.794 Vaz (211)
5.38/.831 Holaday (55)
(Nobody on Detroit with over 30 IP w Porcello had a worse CERA than 4.43)
Price
2.96/.647 Leon (204)
4.27/.738 Vaz (360)
(All other catchers with 30+ IP with Price had a CERA better than Vaz's. One guy, Gregg Zaun with only 43 IP had one close at 4.19. Everyone with more than 100 IP had a CERA or 3.61 or better.)
Eovaldi
2.66/.419 Wong (20)
3.54/.657 Plawecki (69)
4.30/.765 Vaz (147)
4.53/.735 Leon (44)
4.85/.421 Salty (124)
Buccholz
2.83/.642 VMart (241)
3.01/.646 Leon (155)
3.79/.629 Lava (36)
3.95/.737 Salty (207)
4.44/.705 Vaz (130)
4.68/.683 D Ross (73)
5.12/.801 VTek (118)
5.63/.836 AJ P (62)
Others: Alex Avila 1.55/.587 in 52 IP
Barnes
3.69/.624 Vaz (197)
3.83/.697 Leon (99)
4.50/.803 Swihart (42)
Pomeranz
3.32/.721 Holaday (41)
3.92/.745 Vaz (198)
6.02/.934 Leon (46)
Kelly
(Y Molina 2.81/.721 in 176 IP)
3.23/.619 Vaz (98)
3.94/.580 D Ross (32)
4.48/.698 Swihart (74)
4.63/.785 Leon (56)
4.83/.761 Hanigan (91)
Wright
2.94/.611 Hanigan (95)
3.49/.700 Vaz (101)
4.06/.716 Swihart (71)
5.83/.935 Leon (59)
Some sample sizes are rather small with some catchers and some are highly unbalanced. Some are during different parts of a pitcher's career, but the numbers astound me every time I look them up.
The totals:
10 top pitchers by IP
Leading in CERA:
2 Leon
2 Han
2 Vaz (Barnes & Joe Kelly- not the biggest sample size pitchers)
1 by AJP, Holaday, VMart, Plawecki
OPS Against:
4 Leon
1 Hanigan, Holaday Lava, Salty, Ross & Vaz
Last place with 100+ IP by 2+ pitchers:
CERA
5 Vaz
1 VTEk (w Buch)
1 Leon (w Barnes)
OPS
4 Vaz
1 Swihart (Porcello)
1 VTek (Buch)
1 Leon (Barnes)
Out of the 9 pitchers who had 80+ IP with 2 or more catchers, Vaz finished last or second to last in 7 out of the 9 cases in CERA and 6 of 9 in OPS Against.
Only Buch and Barnes were in Vaz's favor.