Sami isn't wrong, every NFL coach considers an injury "not long term" if the player is going to return in 4-6 weeks. He could definitely be back sooner than that, but without more info, we won't really know. Foot injuries are notoriously hard to gauge- could miss a week, could miss a month or two.
Either way, the DL is probably the one place on the team where an injury could be absorbed. Davis is obviously a step down from Williams, but there should be enough rotation between Davis, Henry (or Kaufusi/Wormley if one of them gets activated) and even Ricard to keep the defensive interior fresh enough on running downs and it seems like Pees is going to be sliding ZDS or Judon inside on passing downs anyway.