I believe Baltimore has stated that their top 5 prospects are untouchable, which would include Mayo (3B). That said, i don't think its necessary to trade burnes at this point. Would we get a bigger return than draft pick compensation? Certainly, but then you're creating a massive hole in the rotation. Look at it this way... we are set up to receive ample draft pick compensation with Burnes and Adames hitting free agency. If Hoskins opts out, we could QO him. Not to mention, there is also the Prospect Promition Incentive... not sure if Chourio qualifies for that now that he has a ML contract, but Tyler Black could. Finally, if this season is seen as the all-in year, the Brewers still could deal Devin Williams next offseason for a decent return.
Not to mention all these guys could be gone by the trade deadline depending how this season plays out.
Loooong story short, I don't think we need to trade from our Major League club to acquire the pieces required to go all in. Maybe Matt Chapman will settle for a two year deal too?