Horford's deal is more tradable as it's smaller and also has the buyout option in the 2nd year, but that stands true for any potential deal with any team, not just Washington. If Washington does deal Beal to the Celtics and the Horford deal is involved, it won't be because they really want Horford. It'll primarily be because they are getting other assets as well. Horford as an actual on or off court contributor to a team does have some worth, but not when compared to the size of his contract. Unfortunately, he's more of a prisoner to the deal now as opposed to whatever actual contributions he makes to a team as a player. That is, until the last year of his deal and he becomes a potential buyout candidate and free to sign with any team for smaller money as a backup/depth option.