I don't think so either but I don't think it'd be because of his contract. It's because KD went to GS. Durant was reported to have wanted to play alongside Horford, so Horford's signing made sense. Since Durant chose GS, it made the C's tie up salary for above average but not elite talent or max level talent.
This will restrict the C's from making moves in the future and by the time his contract expires, the C's gotta get ready to pay the youngins.