Agree with your point overall but there are exceptions (value/impact of player, coaching and scheme)They're missing Jeffrey, Sproles & Bradham. I mean it's the end of Nov, that's healthy by NFL standards. Also most people over rate injuries big time. It's the NFL their "replacement" is vg & more then capable.
Howard is questionable but again behind that OL the drop off from the next guy is nothing.
For example, I think if Elliot went down the Cowboys would be F'ed just as if TB12 was lost for the year with us.
It'll be interesting to see how the 9ers' D performs w/o Alexander.