was about to say the same thing - the injury is often used as an excuse as is the lack of talent (which was tbf truly dire) I think people forget how much of that season had been played before Joe got injured... pretty sure we were like 3 or 4 games under .500 before Joe even went down and
that being said...
the 2015 roster was pretty awful in general (the lack of talent added in the 2013, 2014 and 2015 drafts came to bare - outside of CJ Mosley, the only young talent we added in that 3 year period was Brandon Williams, Rick Wagner, Juice (obviously only a FB), Brent Urban (who spent the first 2 seasons injured), Timmy Jernigan (who we traded away), Zadarius Smith who of this list might have had the biggest impact in his rookie year in that 2015 season, Nick Boyle (who spent much of his early playing days in baltimore on the suspended lists)
that's not a great collection of game-changing talent and it came to bare and we started adding more talent again from 2016 and the roster has got better steadily every year since - but that also includes joe being replaced by better talent too
with joe's baltimore career the only real "what if" id be interested in is what if jimmy smith hadnt gone down in 2014