Andre sounds very much like my BWs.
My little guy's a year and a half old and has changed from a very sociable, very easy baby bird, to a young adult entering puberty. Yes, of course, like any species, he has changed. As I said, he's become jealous of my children, standofish with strangers, generaly less tolerant and makes his opions and temper known. But, because of our constant training, he's not become a one person bird and he's learnt to tolerate my children instead of trying to chase them away from me, he's also incouraged to interact with visitors even though he wouldn't if they didn't have treats for him. (he used to love everybody)
I don't see why maturing into an adult bird would automatically go hand in hand with agression. Any time I see a potential issue arising, I work around it and compose with him so he has no need to become agressive.
I don't find him hard to manage or moody or anything... just minor changes and some atempts to bond to closely to me. (food regurgitation mainly, he would be jealous of Cheyenne if she was getting to much of my attention to his liking etc.)
I know that some people experience hormonal problems with their birds and i'm not saying you're doing anything wrong with your pis, but I don't feel it's fair to say that males are more agressive than females and that you have to automatically expect it when puberty hits.
It's good to be warned of potential problems so you're prepared for the worst, should it happen... but I guess I have problems with generalisations.
I feel like females can have potential problems like excessive egg laying, becoming cage territorial, one person birds, moody etc. I definitely felt my Cheyenne's hormones kicking in more than Apache's and she's always been less "cuddly"... but I do realise that he's not fully mature yet so he has time to change.
Anyway, we're all entitled to our own opinion on this subject.
I know that it greatly varies from one individual to another. I just feel like most pionus parrots are no where near as agressive as amazons or toos...from what i've heard and read throughout the years anyway...
As for getting along with another male pi, it's much easier when introduced as young birds who have bonded before puberty hits. They sometimes form same sex mated bonds... i'm hoping mine will get along, being young and having never been single birds...