The defensive line has been battered.
The DEs cant do it all. Part of containment is ensuring a solid middle. When the DE has to assist with that, it’s hard to get outside.
I’m not asking the DE’s to “do it all” - just contain the freaking run. If Bosa’s a better interior lineman to laser-beam rush and sack the QB then move him there. Everybody’s linemen are bruised and battered this time of year.
But if the Niners’ focus on both rushing and containing the opponents’ backfield, they’ve got the best chances IMO.