I dont think you mentioned whether Bruiser was supposed to be a teacup or not. If you got him thinking he is, then he's not because i dont believe they are to get that big. Remy is now 11 mos and is just 5.3 lbs. (teacup). I, too, leave food in his bowl at all times, and he eats when hes hungry or on my schedule, and hes maintained his weight. When i got him, the breeder told me he would max out at 5 lbs. But i think it can vary slightly.
I like that, "Teapot"
Thats so cute! Im sure hes perfectly healthy. Just make sure hes not eating 3-4x a day anymore, by 9 mos, he should cut down to about 2x a day.