It sounds like a joke, claiming that San Francisco 49ers fullback Kyle Juszczyk is the key to the offense of his fellow Kyle (Shanahan). And some otherwise intelligent people can’t get over how much the Harvard-educated blocking back is getting paid.
But I stand by that statement. Generally, Shanny’s scheme is all about being multiple, all the time. Any player allowed to touch the football can score on you, on any play, even a blocking TE such as Levine Toilolo. More specifically, 2-back formations including Juice pressure teams to keep their base defense on the field, allowing Shanahan to pass against a slower, heavier lineup.