If MK and C&G were to attack say GATO and GATO were getting curbstomped and we jumped in to help MK, yes then we would be bandwagoning.
If say NpO and co were slamming MK and C&G and NpO and co were the stronger side we would defend MK and would NOT be bandwagoning.
But, this is how simple it is. Attack our friends and we will defend them. Attack us, our friends will defends us.