Grebllaw,
Good point, though I do see several breakers (in the second row up) that look like they say 7-1/2A.
I guess another possibility might be that the 25A breaker wasn't holding its rated current, but would power the alternate gear extension motors once the other loads were disconnected on the ground. Even then, as you point out, the crew could have solved the problem by pulling the other breakers on the bus.