In December, 2003 Sexson was traded from Milwaukee to Arizona. You’ll notice Jorge de la Rosa in the right-hand side of your screen. This is part of the Schilling trade featured here a few days ago (in reverse, as these would be players leaving Arizona not going there).
The Brewers let the majority of the returns for Sexson leave via free agency, but only Sabathia garnered any return in terms of compensatory draft picks.* Both of the draftees via Sabathia - Walla & Davis - are currently working through the Brewers’ farm system.
*Our draft database is nearly complete. I’m through 2008. Hopefully in the next week or two we’ll have something new and shiny to play with.