I agree with that. That's my opinion too. He thought Malfurion wouldn't become much of a threat to the Night Elves and hadn't killed him, but rahter kept warning him about his actions.
It will be interesting to see what his relationship with Malfurion is like in the Sentinel path. He may not play a huge role, but we'll see him, maybe in the interlude Battle Preparations. Will he be nice to Malfurion, or maybe still suspicious of him
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Here are some of my boss battle predictions
1. Malfurion, Illidan and Tyrande vs Kil'Jaeden (this one is obvious, and many other have also predicted this)
2. Malfurion, Illidan and Tyrande vs Azshara (after Illidan breaks free of her, or she reveals herself)
3. Malfurion and other Night Elf heroes vs Kazzak (he never fought any Night Elves in the Highborne campaign)
4. Tyrande vs Eredon (Xavius may also be involved, Malfurion may or may not have been saved, but we can be certain these two will fight, plus they have already met before, in Jeopardy of the Horde, so it will be a "you...I remember you" moment)
5. Illidan and Tyrande vs Jaraxxus (these two should reunite at some point, and maybe join together to fight a common enemy, (maybe in Final Conflicts) and this is also where Illidan and maybe the rest of the Highborne ally with the Sentinels)
6. Malfurion, Tyrande, Faradrella and Jarod vs Magtheridon (this is an optional quest, maybe in Cries of the Aspects, where they discover another fountain of power, and Magtheridon appears, and empowers himself, and they fight him)
7. Something involving The Exiled One, Balnazzar, and Varimathras
8. Something involving Nozdormu (HIGHLY UNLIKELY, but I think it would be cool to see as we didn't get a boss battle with him the the Highborne path)