Assets: Pitching depth, first base
It's somewhat of a mystery just what the Mariners are doing this offseason. Are they trying to compete or are they pulling back? They traded away some big league pieces like Eugenio Suarez, Jarred Kelenic, and Marco Gonzales, and they haven't exactly done much to upgrade their roster in those moves. They haven't been shopping for the upgrades they need either.
The Brewers have been in a somewhat similar situation. They expect to compete but have parted with Brandon Woodruff and outside of signing Jackson Chourio to an extension, haven't done much yet to upgrade their roster either.
These two teams have matched up on several trades in the past and they very well could do so again. With the outfield in flux again in Seattle, perhaps they would be interested in one of the Brewers outfielders as a splash addition to improve their lineup and list of controllable assets. Also relievers are always of interest between these two clubs.
As for what the Brewers could look to get from Seattle, first baseman Ty France would represent a significant upgrade for Milwaukee over Jake Bauers. He has two years of control remaining and is a reliable player, playing in at least 140 games each of the last three seasons. France was an All Star in 2022.
There's also pitching that Seattle has. Whether it be a bullpen arm like Taylor Saucedo or a starter like Logan Gilbert that could be available, there's arms here that could intrigue Milwaukee.
There may not be an obvious, perfect trade fit from the outside looking in, but with these two teams' history with each other, there's always a chance a trade comes together.