Jimmy G. was benched too once Brady came back.
Here's how Brock played:
20/27, 250 YDs, 2 TD 0 INT (+Offensive Player of the Week)
23/42, 270 YDs, 1 TD 1 INT
16/26, 166 YDs, 1 TD 1 INT
35/51, 308 YDs, 0 TD 0 INT
21/44, 296 YDs, 3 TD, 1 INT
27/39, 299 YDs, 1 TD, 0 INT
Here's how Jimmy played:
24/33, 264 YDs, 1 TD, 0 INT
18/27, 234 YDS, 3 TD, 0 INT
(then injured + benched)
This is way too small of a sample size to draw any hard conclusions, but based on what's there it seems they played pretty similarly overall. Brock played in 3x more games so of course he had more INTs. Jimmy caught fire in Miami before hurting his shoulder. Who knows what he would've done with 4 more games? You seem to, based on two games, but I'm not sure how you're doing that lol.