There must be a good reason before waging a war!
Without a justified reason, the initiator of a war would be accused by others. Over the course of history, every war between the universes were under good pretenses, or at the very least, a tolerable excuse.
What was the excuse this time?
The five families could not have said that they were threatening and attacking at the Leng Family, which would be utter humiliation. Therefore, Jun Hongye used Lu Li as the shield. As for if the excuse could convince others, that was not Jun Hongye's concern.
Leng Family wanted Lu Li dead. So, they were here to save Lu Li. It was that easy! As for who Lu Li was… that was not important. All they needed was a plausible cause.
As a matter of fact!