Well I'd suggest that MAN is about to reap the reward for failing to invest in terminal capacity in recent years.
All well and good saying that T3 is not suitable for the AA operation - it clearly isn't - but what are the alternatives?
T1 is totally rammed in the peak morning as MANFOD Has pointed out. FULL.
T2 there are no parking spaces now in the morning peak. Add in the soon to start CX777 and the increases by SV both arriving at THAT time of the morning, where would you put 2x AA 767s and an A330?
Premium pax are not going to tolerate being bussed from and to their aircraft - they'll choose alternatives and that will hurt AA's yield.
Why would AA agree to receive an inferior service so that RYR can access contact stands and put themselves at a competitive disadvantage to DL and UA?
Madness.