49ers mailbag: Panic over Garoppolo, fullback, long snapper?

San Francisco 49ers starting quarterback Jimmy Garoppolo (10), right, throws a pass while being pressured by Cleveland Browns’ Olivier Vernon (54), left, during the first quarter of their game at Levi’s Stadium in Santa Clara, Calif., on Monday, Oct. 7, 2019. (Randy Vazquez/Bay Area News Group)SANTA CLARA — A 4-0 start isn’t enough to alleviate some 49ers’ fans concerns, so let’s try doing that in this week’s mailbag via questions through my Instagram and Twitter outreach program.

If Juice is a no-go for Sunday, what changes does Kyle make in the run game? (@geoffcast)

Fullback Kyle Juszczyk, arguably the MVP of the NFL’s No. 1 rushing attack, indeed is out for at least Sunday’s game at the…