It's not weird at all angu. Kids are so drastically different from each other, even brothers. My eldest sounds very similar to how you are describing your eldest. He was (still is!) very independent, articulate, a thinker and a figure-outer, needed to have very complex things to examine and put together, he was never a kid who played with toys he would rather look at the TV remote and try to figure out how to make the DVD player open. He has always also been someone who will try to figure out how to not follow directions or how to get around being told with a logical reason. It sounds like you may have a little one who's got the make-up of being "gifted" or "spirited" as they tend to share these same characteristics. My second son is also very similar to how yours is. Very cuddly and loves to be around people, loves to be a pleaser, actually plays with toys and use his imagination, will follow directions and is super sensitive to any form of discipline. M is proving to a mixture between the two, but I think she may follow the lines of #1 as she is just as head-strong as he is and has many of the "gifted" characteristics as well. It's like they are so intelligent in some ways that it makes them easily frustrated in others.
I agree with Frus about BPear. I think he's putting it all into storage and one morning he'll just walk in the kitchen and say "mummy, may I please have a slice of toast on the diagonal with a smear of butter and marmalade?" 
Speaking of word usage: M was listening to the boys tell knock-knock jokes this morning and now she's saying "knock-knock" so you say "who's there?" and she will just mumble something and then start giggling and covering her mouth with her hands. It is so funny!
Really funny on the "cock" word frus! Also hilarious that Calf was talking about the logistics of the toilet at the table, agnu!
#2 has this weird habit of instead of saying "Mine" he says "mine-guh". No matter how many times we correct him and really emphasize on the "Nnnn" sound, he still does it!