I don't believe the issue with the seniors is lack of leadership but rather lack of talent.
For various reasons, this year's senior class just hasn't made that much of an impact, aside from Hyde and Ferentz. Davis I'd take back as a #2 receiver, where he did a pretty good job, but he just hasn't shined as a #1 (I actually view KMM as that guy now). Hyde is pretty solid, though not as dominant a DB as we're used to (think Spievay and Godfrey), and J Ferentz has been a steady player.
So that's three guys, but there's another 22 guys you need to field a team, and that's the problem. I don't doubt the commitment and effort of the other seniors, but the talent just wasn't there, and I doubt that would be news to those players--they know this is not that talented a team.
When a team doesn't have the talent it can get by on chemistry and drive, but this team didn't have that, and that comes down to a) coaching and b) injuries. But even without the OL and RB injuries, this is still a 7-5 team at best, which gets us back to a) coaching. I'm not sure that's there at this point, so I am almost ready to assume that ANY team we now field is likely to under-achieve, whether it's a good team like 2010 or a below-average team like 2012.