Or maybe that is Bishops beef with the Salamandrians. In the preview for season five there is one point where Bishop says "Salamandrian's are forbidden in this Galaxy." To Mona and Sal.
And in the recent previews, we saw Newtralizer attacking the Utroms. And the impression we were given he doesn't discriminate between the Kraang and the Utroms.
So maybe in the past, Newtralizer may have been the one who killed King. And even though the Salamandrians did assist in the war with the Kraang, they were still responsible for the death of their leader.
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