The intent of this rule is to prevent teams from leveraging an injury to help a guy clear trade waivers. It looks like Toronto may have done that here, although it wasn't necessarily egregious -- Donaldson had just started a rehab assignment, so he probably was clear to be activated at any time. The weirdest part is how an MLB official was apparently involved, warning teams about Donaldson's health ("buyer beware"). Is that normal? I wonder if any of the teams asked at the time, "why is he even allowed on trade waivers then?" Because that warning could have discouraged claims (although it likely discourage Cleveland as much as any contender, and Cleveland had the top waiver priority among contenders anyway). It's tricky, because I think he was close to returning and MLB didn't want to prevent a trade, and at the same time, they didn't want a team to claim him, get stuck with the full contract, and complain they received damaged goods. At the very least, the league probably should have told Cleveland they couldn't keep him on the DL for additional rehab, though.