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[..]
 //Topics to subscribe
multiSubscriber = node.subscribe("fcu/status", msg_queue_size, &statusCallback);
multiSubscriber = node.subscribe("fcu/current_pose", msg_queue_size, &poseCallback); 
[..]

This is your problem: you cannot subscribe to multiple topics with the same Subscriber instance. There is a one-to-one correspondence between subscriptions and subscribers (at least in ROS1).

[..]
 //Topics to subscribe
multiSubscriber = node.subscribe("fcu/status", msg_queue_size, &statusCallback);
multiSubscriber = node.subscribe("fcu/current_pose", msg_queue_size, &poseCallback); 
[..]

This is your problem: you cannot subscribe to multiple topics with the same Subscriber instance. There is a one-to-one correspondence between subscriptions and subscribers (at least in ROS1).