Now I can see why the 11.30 to BOS doesn't clear because there isn't enough gates but there is no reason why the 15.45 to ORD can't because USPC is open and the same for the 14.00 to BOS.
So, the same problem will apply if and when better times arrive and more T/A is required. Looks like those who said that T2 was built in the wrong place and, therefore, too small were right. Presumably this situation is also detrimental to the EI/EIR clear-at-DUB-from-the-UK operation.