Let's see the Bills D for a few more weeks to see how teams are going to attack them. Ravens have probably the potential best running attack whereas the Texans may present more air attack with a more balanced QB than Tua.
On offense, though, I think the focus so far is on running attack where they featured more bigger WRs and TEs from snap perspective. Explosive passing seemed to be something that is lacking - they tried with MVS, but no fruits for now. That is an area (with no known quality at the beginning of the season) they need to figure out, not necessarily to be a strength but a tool that is functional. I can see a team like the Jets go with man outside and crowd the middle to stop the run and short passing game to give the Bills offense a bigger challenge. Hopefully someone will step up with the progression of the season, e.g. Coleman winning more one-on-one outside.