The Chiefs haven't re-signed Donovan Smith, who started last year, and Bakhtiari is a much better player.
The health question marks are obvious, but the Chiefs could handle Bakhtiari missing six or seven games if he's healthy enough to play from November on.
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He also did an interview after being released saying he prefers to only come back once fully healthy and only if he feels he can perform at top level. In the same interview he talked about how he wants to win the “ring that’s been so elusive to him over his career”.