From the video

They use Brilen Allen as the short yardage back and the passing down back. I would think Bree probably is going to be in close to like a 50/50 snap share split with Brilen, though he'll have the backfield touches about 65% to 35%.
Mentioned at 11:47 – 12:03Captured by STACKED 2 hr after posting
STACKED’s take
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Short yardage and passing down specialist in 50/50 snap split.
Used by the Bills as the short yardage back and passing down back, limiting Breece Hall's role; expected to operate in close to a 50/50 snap share with Hall, though Hall will receive about 65% to 35% of backfield touches.
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