[TuckerDuckson]

When rebuilding its all about selling value for low key prospects. Say you take over the Brewers for simplicity, say for some reason you got Aaron Hill batting .333/.450/.546 (which would never happen) with a .390 BABIP, obviously it's unsustainable, so you would want to flip Hill as soon as you can, trust me the AI goes crazy for current production, in my current league I was able to flip a 2.5 star SP (who was 10-2 with a 1.45 ERA) for a Young, cheap left fielder with a huge ceiling.

This also brings up the thing of free agency, try to sign "bounce back candidates." My example here is John Danks who I signed for his Age 39 season. He's a lefty extreme ground ball pitcher in Comerica Park, this caused him to go 7-5 with a 2.45 ERA and a subsequent flip for a 4 star prospect.

When your rebuilding NEVER sign people long term, it will eventually screw you out of house and home, because your 5 star closer who you signed to a 15 mil pact WILL get Tommy John Surgery and deplete to a 1.5 star player after he gets back.

Other general tips are getting guys with low "desire to win" or else you will have a mutiny on your hands like the Tampa Bay Rays who's two best player really care about winning, but they constantly lose, and this rift will causes you to lose more.

Drop cash on the international free agents too, most of the sub 100k players are for sure burnouts. It's around a 95% chance they either, get hurt, retire, or just don't perform. The more cash you spend on the player the higher chance they will succeed. Even though it's not guaranteed, (heck I've had 8.5 mill players burn out over the course of 2 seasons.)