Huh. Interesting. My pup is much more confident than my older dog. I regret having my older boy neutered so young, tbh, as he's a nervous chap and a behaviourist suggested that neutering can make that temperament worse. Another reason I'm having to pluck up the courage to send the little chap for his bollockectomy.
I would say it is all personality based. I had an 11 yr old and a young pup, both males, the older one was always dominant from day 1, there were a couple of challenges from the pup. I think it depends on the dogs.
I have two dogs. One is 2.2 yrs old, and one is 7 months old. They are both dudes. The elder dog was neutered at 6 months, the pup is yet to be done (but will be done). At the moment, the pup defers to the older dog in most matters, eg gives up toys, lets him eat first, moves if older dog wants to lay in a certain spot etc. No agro, they rub along together really well, but there is a definite structure to their relationship. Now, I am getting the pup neutered, but say I didn't: would that upset the status quo? Would an entire male automatically take over the privileges that my neutered boy seems to have? Or is it much more personality dependent? I admit that one of the reasons I will be neutering the pup soon is because I'm worried about anything kicking off when his balls eventually drop.