Well yeah, and if it's a bench trial the judge will surely sort through all that calculus with a fine tooth comb. But a jury will quite likely say "11 months and they didn't even try to slow it down because they denied it was even there?" People actually staring death in the face don't care about "5 year survivals" -- they care about months and weeks and days.
Understand fully.
And any doctor can make a mistake. Having said that, these doctors at these hospitals are amongst the best in the nation. I think their films are read by students, residents, attendings --- multiple layers. It is easy to see a shadow in hindsight. We only have one side of the story since the doctors are not allowed to comment.