but I would say he should draw from a different pose rather than copying the original pose
better practice even if it won't look 100% correct
Practicing copying lineart is a good prerequisit for copying real life objects and the like, which is a legitimate form of illustration. Do I do either? No, but the fact of the matter is it's fine for others to. That being said, I appreciate people posting a reference. There are plenty of times where someone draws something that stupid people get giddy over because they don't know there's a source. I've seen this a lot with people copying toy photos for drawings on deviantart and stuff.
If the person gets mad about you posting a source, then yeah, you should get on their ass. That didn't happen here.