Hall projects above average in a LH platoon.
And a quality LH bat wouldn't make sense given the cost with Harper back the second half.
the proposed solutions:
Drury RH - unless we're benching Castallenos (who looks better, see what Long can do) ???
note that RC+ 123 may be a fluke, other full seasons, 102, 92, 66
Myers - RH 1B/OF who at 32 isn't a great bet: 107, 107, 97, 155 (218 PA), 110, 104
Mancini - RH 1B/OF 93, 132, 105, 104
Martinez - RH DH 36, 127, 119
Profar - Switch, 2B/OF 107, 90, 113, 86, 110
Only Martinez had a chance to replace Harper's bat, and he's a RH DH. Which means he's got no spot when Harper returns. I think Dombrowski looked at these options and figured Walker, Soto and Kimbrel would help far more on the margin.