It IS hard to believe he's the same cat. I love him to tears. He's been a fun one to watch develop personality wise.
He is a big kid. We're not exactly sure of his weight right now, but I'm guessing he's right around 13 pounds. Shorter, very solid, and built like a bull. Especially compared to his older brother. However, his huge coat in the pic above does make him look even larger than he is.
I groom both he and Truman often. No less than twice a week. But right now Baron has been getting it a bit more. I keep a greyhound comb laying around because Baron's ruff is so big that he had troubles cleaning it, so I help out once or twice a day with a quick comb out. Truman had this same problem last year when going through his first full winter coat.