Absolutely, I wasn't trying to say that Portugal would be the most inferior of the, I guess it would be if all three united, three Crowns of Portugal, Castile and Aragon.
Yep, Portugal's military is overlooked too much in game, even the new ideas still lack the military punch that Portugal could provide, I've also been very critical of Portugal and Castile being "Historical Friends" in-game
despite the fact that they went to war with each other 8 times during EU IV's time frame.
It's possible but of course we'll never know, honestly I think it would be cool if the new Spanish capital event was changed and more options were given, depending on what territories you had. I still do think that Madrid would be very tempting for a Spain that controls all of Iberia and the Balearic Islands and Macaronesia, but alas. And absolutely Portugal's CoA would be in the flag, the problem is there is no Spanish flag to use that had Portugal included in it, except for the one used during the Iberian Union period but that flag includes many other CoA that might not be a part of the country, such as Austria and Naples. So we're kind of stuck with the Cross of Burgundy, but that's another specific incident flag and Burgundy already uses it, though they could be changed to their proper CoA. So we're kind of stuck, we could make a more neutral flag, maybe you take the current flag and remove all the CoA but that flag wasn't designed until near the end game and it's very much tied to modern day Spain which modern day Portugal might not be too fond of being similar to. The flag really is the big problem with Spain for Portugal, or any other Iberian minor that somehow breaks free and forms Spain. So I get wanting to change it, and I would love to hear some of your ideas on what flag would work best, but I fear it might have to be a fictional one which I'm not too keen on.
Not unless this new Spain went on and integrated the Crown of Aragon into Super Spain!

But yeah I do see what you mean, I was just giving an example for if a Spain had all of Iberia.
I was not aware of that, thank you for pointing that out! I've only really seen the surface of that idea/belief.
I'm more against it just due to the fact it wasn't a country, it was essentially barbarians, parts of Leon seem to be considered part of Lusitania so it's not exclusively Portuguese, and overall I think it's a bit silly.
So at the end of the day, the big problem really is that bloody flag! I blame it all on Spain, which in my opinion, has had some pretty bad looking flags over the years, the only flags I like are the old CoA ones from the Crowns of Castile and Aragon and some of the minor states that weren't incorporated into their respective Crown's flag.