What figures are you seeing? Loads I assume.
No view of costs, revenue or yield, p2p or connecting? We both know there are people well above our pay grade who will crunch those numbers and decide if moving a B763 into the market vacated by B757s is a smarter move than adding capacity into one of the other hubs. It's not about "clogging up space", it's about making most efficient use of your assets.
There are some tough decisions to be made out of who wins and who loses across American at DFW, JFK, MIA, ORD and US at PHL,CLT and PHX and we won't know for a while yet.
With the B772 losing First class it may be an opportunity to upgauge ORD and drop one route from CLT/PHL, and that's not really a bad thing all in. That way American is hubbing through a maximum of three gateways rather than spreading itself over four. The p2p on Charlotte won't be anywhere near a Chicago or New York.