If you watch the youtube video i posted earlier, it shows that on almost every play there was a shallow option, and when there wasn't, there was room for Lamar to run for at least 4-5yds.
Either by design or by Lamar pressing for the big play, it seems his primary read was always a deep pass. On many plays he didn't have time to progress through to find the short dump off. I would have thought after half time they would have adjusted and focused on the short stuff until KC adjusted, but nope, it was more of the same.
Another thing that video shows is dumb use of OBJ. They sent him on go routes multiple times, but he just doesn't have the sustained speed anymore. Completely covered. When used correctly (precise routes, comebacks, crossing etc), he was open and made a couple catches.