Trevor Bauer trains in the offseason at Driveline Baseball in Seattle:
... and is familiar with at least one member of the Seattle Mariner rotation:
After shedding big contracts, the Mariners have payroll flexibility:
https://docs.google.com/spreadsheets/d/1P55um0jB8gsz4M2Q7hFeD6aFki7n74DBC1tsWXwoD5U/edit#gid=1520401900
The righthanded Bauer would complement three returning lefthanded Seattle starters who this year have posted 1.7 fWAR in 10 starts, 1.4 fWAR in nine starts and 1.1 fWAR in nine starts:
https://www.fangraphs.com/leaders.aspx?pos=all&stats=pit&lg=all&qual=0&type=8&season=2020&month=0&season1=2020&ind=0&team=11&rost=0&age=0&filter=&players=0&startdate=&enddate=
https://www.fangraphs.com/leaders.aspx?pos=all&stats=pit&lg=all&qual=0&type=8&season=2020&month=0&season1=2020&ind=0&team=3&rost=0&age=0&filter=&players=0&startdate=&enddate=
With team options, the Mariners control southpaws Marco Gonzales, Justus Sheffield and Yusei Kikuchi through the 2025 season.
One downside is that a resulting rotation reshuffling could block the progress of righthanded Seattle prospects Emerson Hancock, Logan Gilbert and George Kirby, who currently are ranked No. 31, No. 36 and No. 100 in MLB Pipeline's Top 100 list:
Top 100 Baseball Prospects | MLB.com
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Another option might be righthander Taijuan Walker, who last offseason as a non-tendered free agent chose to return to Seattle despite a dismal 2020 forecast for the Mariners.
Bauer and Walker.
Or not.