its always so confusing to me....
i have a one year old yorkie that is Barely 2 lbs. his daddy is 2 1/2 lbs and mommie is 5 lbs. the mom had 4 puppies 2 males and 2 females.
they are now...
one at 7 lbs.
one at 5 1/2 lbs
one at 3 1.2 lbs, and mine at 2 lbs.
i think its difficult to say, and those charts are not always correct. I hope he stays little as you want. personally, i think a 2 lb doggie is TOO small.
good luck!