You seem to be completely misunderstanding what was written....which seems to be a running theme on this website.
I mean, seriously, if you guys show the same at school, I am seriously doubting how well many here are doing in classes.
Also, you are in the prime of your life and are nowhere near some genetic limit of size gained. I would expect you could gain more than 6lbs in a full year.
But please, go ahead and miss that hormonal once in a life time chance to maximize gains by limiting things to that degree.
I would expect a serious vet of more than 5-10 years to be happy with 6lbs, not a beginner to intermediate lifter with goal of extreme development.
Then again, I don't know your specific goals.
What was written before was someone gaining OPTIMALLY while remaining that lean.
Also "@ 10% body fat" is NOT "8%" body fat.