yes that's true
i mean the habsburg already fcked up the whole situation with the sex between their own family and the "validos", but spain was still the biggest power in europe. not castille, SPAIN
but after this, aragon lost absolutely every right to be independent, the next monarchs didnt care about anything except castille and the whole empire went to shit
the duke of olivares wanted this monarchy to be centralized, but didnt think that the next monarchs wouldnt give a shit about the other lands
in any case, after felipe II everything went to the "pozo"