If Taylor Davis is coming on an MiLB contract, it doesn't matter. A month until Spring Training and any number of things can happen before Opening Day:
Injury, ineffectiveness, or a trade.
Depth right now is good. If Sisco, Severino, or Wynns gets hurt and may miss a substantial chunk of time, Holaday or Taylor could get on the 40 as insurance. If a team calls and asks about Severino and offers up something that gets Elias interested, open roster spot. Taylor or Holaday come into camp and hit .100 with 20 strike outs, they can be released without another hit to the 40.