Capt is in your list of marvel copied dc characters. That said if you didn't bring hi up ignore it now.
They are simply coincidences. Doom Patrol came out 3 months before the x-men everyone at that time in the industry said that is too close for them to have copied anything considering the lead up it took to produce comics and have them ready for shipping back then, same with brotherhood comparisons and probaby even more so then because they both premiered the same month. So nah, the doom patrol X-men ripoff claim just doesn't pass reality test.
I don't see anything from Batman in him, nothing more than any other character in a western comic who is supposed to be smart. can you tell me the influence that is pure batman in the character, that you see?
i had to go back and look...yea, i brought him up as a 'borrowed' idea....not that they borrowed his character like they did deadpool, but more so what his character represents...he's the marvel superman in every way for the most part, expect he's human...which i dont mind at all, that's why capt is my fav marvel character...but that's whatever...i didnt mean that in a negative way...just like i didnt mean it in a negative way that bp has some bat in him...a lot of characters have bits and pieces of other characters in them...
those are some serious coincidences, but ok...
besides the intelligence like you said, i see: prep time, the loner/not so willing to work with others, having plans for others even if he works with them, and being a peak human in pretty much everything (until the upgrade, he's now surpassed bats)...i admit it's not as blatant as iron man or moon knight, but you can see some bits/pieces...