But several have made it after being traded, not seeing the field for years, etc. Your argument is completely semantic. There are several QB who failed/had the team that drafted them give up on them...THAT'S the real issue here. You are trying to turn circumstances into an argument that he played and failed. The only FAIL here is your weak argument.
And simply because someone hasn't done something to date, doesn't make that thing un-doable. If Brohm succeeds will your argument deteriorate to "the only QB that was drafted in the 1st 10 picks of the 2nd round, that was cut...". It's really all nonsense.
You have yet to even attempt to explain why GB tried to sign him after the Bills made their offer.