Why was John the only one to appreciate Ellis when he first arrived?

Both Weir and Carter had an issue with him and Rodney butted heads with him as well.

But in the "First Strike" episode, we see Sheppard act in a very mellow way toward him. I feel like he's the superior whose orders Sheppard has obeyed without objecting.

Both Weir and Carter had an issue with him and Rodney butted heads with him as well.

But in the "First Strike" episode, we see Sheppard act in a very mellow way toward him. I feel like he's the superior whose orders Sheppard has obeyed without objecting.