Look, I agree with your statement about career ending injury, but to say injuries had nothing to do with his retirement is delusional. But choosing to retire (no matter the reason) and having a career ending injury are two separate things.
This article suggests he had a good game. It may be biased though.
https://www.colts.com/_mobileview/news/jonathan-taylor-zack-moss-carries-snaps-running-back-shane-steichen?mcid=&tags=7b9qMXE%2CQX8R7xO%2Cd6Dkb4g%2CdNtMCfg%2CmucUmbQ%2CfbAllUsers%2CfbHighContentConsumers%2C
I think @John Hammonds has been a big supporter, and I'd like to say French has done a great job filling in for Kelly. Against one of the best run defenses, helped rush for close to 145yds.