Toronto has the ability to put together a very strong package for KD if they're motivated to. They're now the 2nd favorite to land KD per the betting odds. I don't know if BRK would actually send KD there, since it's not a team he mentioned wanting to go to. However, TOR has the ability to push the value of the trade package up for KD and pressure the Suns to find a way to get Mitchell in the deal.
In other words, Ainge would fleece the Suns in a trade for Mitchell so that the Suns can close the KD deal. We'd want it to reach a point where BRK says, "Get me Donovan Mitchell, or I'm not sending KD."