Jim Bob
RIP RJ
It takes more than one or two practices to do it at a high level.Johnson has been in the scheme for a long time. NB in the scheme is harder than safety with what the teams asks of the NB. Johnson won't need to put in an entire training camp worth of work to play 15-20 plays at safety for one game.
Not to say that the Bills are doing that. But I got to the Bills two years after they moved Bennett to ILB in a 3-4, and three years after the implemented a 2-5 defense in-season when Bruce Smith was hurt. It's not that difficult.
And if they haven't been working it in practice up until now, they aren't likely to try it leading up to a big playoff game.