Kaiser, Oh WOW!!! Seriously, when I looked at picture #2, I was "this is spooky, I have seen that look before." Would you mind telling us who the parents are? John and I have brothers from Select.
I have seen small and large from Select. Five pounds at 3 months seems large to me, but you can never tell. Rascal looks quite large, because he is tall and long, but he is thin, and is around 12 pounds. My son has a moose in the 20 pound range but that cat is built like a linebacker. (all F3's in the boys). Rascal is 3 now, and I swear I have seen him fill out in the last few months. He might hit 15 pounds if he slows down, which I doubt. Lately he is eating everything in sight. Mayhem doesn't fancy food very much and has the highest energy of the bunch. He is a little over 10 pounds.
Hang in there. In a few months you won't care what size Charlie is, you will love him for who he is.
(and then Dale and Holly get a phone call inquiring about a future acquisition.... BTDT!)