The Achilles injury could turn out being a blessing in disguise. If Fisher doesn't tear his ACL he either could've returned to KC or someone would've paid him a lot more money to play elsewhere. If he comes back healthy and produces, getting him at 9.4 million would be a steal in 2021. If he didn't get injured he could've gotten around $15 million a year from someone. Castonzo was making roughly $16 million a year before he retired.
Correct me if I'm wrong but I'm fairly sure plays get throw out if they can't tell what was going on. I vaguely remember hearing someone from PFF explaining this process. I don't think they just guess.