My theory is that the Bills will not trade up: either no partner or the cost is too high.
I think a DT and LB will be taken at 21/22. The 2 seconds will then be packaged to get back into the first round for Rudolph or Jackson. This will give the Bills a 5th year at a reasonable cost if the QB works out.
In FA, a bridge QB is signed who can also start the year if they lose out at QB,
In all scenarios Taylor get cut.