The Mariners defense is never going to be much better than average, at least in 2019. Getting Kyle Seager back in June will certainly help. But until then, the defense is going to be an issue. One way to mitigate some of those risks is to have a good utility option to play in the later innings.
The Mariners have already done that many times this season, usually by subbing in Dylan Moore late in the game and moving Ryon Healy back to first base. But Moore has been underwhelming, albeit in a very limited sample size.