This works because Robinson has that ETO which means his contract is only guaranteed for $9.888 million.

Celtics flip Holiday, Hausser and Porzingis for Ball, Highsmith and Collins. Take a year to reset a bit with Tatum out, none of these guys are guaranteed for 2027 but could easily be brought back in. They would stay competitive with cheaper role guys while keeping Horford and staying under the 2nd apron avoiding large penalties.

There’s not fairytale solution where this gets done and the Celtics get a great return but this is pretty realistic to me. This trade also leaves room for 1 more free agent, a second round draft pick and 2 2-way players all for $6.1 which is doable.