The 49ers’ wideout room looks less like a depth chart and more like a weekly emergency plan. “With Aiyuk being on PUP, we started with 13 guys. And now, we’re down to—at one point yesterday, I think we had seven out there,” GM John Lynch told KNBR, the exhaustion in his voice indicative of what the roster couldn’t hide: the fact that the Niners’ receiver room is hanging by threads.

Jauan Jennings hasn’t touched the field since July 27, still nursing that stubborn calf injury, and Kyle Shanahan’s optimism has started to sound like wishful thinking. The trouble is, even Brandon Aiyuk —fresh off knee surgery and stuck on the PUP list—has logged more visible fieldwork than Jennings. But Jennings is only one piece of a much larger wreckage. San Francisco has been getting chewed up

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