Roster moves, in general, make sense in two instances. If they make the team better now without cratering the future. Or, if the future is aided without spiking the present. If the Cubs can make an addition that falls in either category, it should be weighed based on those considerations. An opportunity cropped up recently that should make the Cubs better in 2020, without subtracting any valued piece in 2020 or any other future season. The Cubs should sign Luis Avilan.
Occasionally, 40-man roster rules make a team ideal for considering regarding a transaction.