Yelich has upwards of $120M in surplus value, but given the unimpressive return they got for Ozuna I imagine offers totaling ~$100M could be plausible.
So take Yelich’s value and subtract the negative value of someone like Prado, Chen or Tazawa, and you have the value of the package overall. However, I find it extremely unlikely the Braves went to all that trouble to rid themselves of Kemp’s money in 2019 only to take on other bad money in 2019. Maybe Prado is an exception to that though.
Approximate value of the Braves prospects not named Albies or Acuna:
Wright $35M
Gohara $35M
Allard $25M
Soroka $25M
Newk $20M
Anderson $20M
Fried $20M
Pache $20M
Riley $15M
Wentz $15M
Add them up any way you want, but it is very unlikely the Marlins trade Yelich without getting at least 2 FV 55 guys as the centerpiece.
A trade for Yelich almost has to coincide with the Braves trading Markakis and/or Teheran to free up salary to take bad money from Miami. The cost in prospects is likely too steep otherwise.
It also likely requires the Marlins overvaluing MLB ready pitchers like Newk, Fried or Sims as a substantial part of the return. I could see the Braves selling high on Camargo as well if the Marlins are fans of his.
Having said all that, AA might very well be cooking up something none of us even imagined that gets Yelich to Atlanta.