To the OP, this still applies, regardless of your last response to it.
Could we accurately predict your potential if we had unlimited amounts of perfect data on the entire human race regarding arm and wrist circumference, training time, age, exercises used, diet, lifestyle and supplement strategies?
Maybe, but even then there will be exceptions.
And we'll never have that data.
Let's do ourselves a favor and throw out the notion that potential can be accurately predicted.
Furthermore, it's in our best interest to take the ideathat predicting potential is useful, set it on fire and piss on it. Because as soon as you go down that path, you place limits on yourself - and that type of mindset is not conducive to getting truly astonishing results.