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More of a Studio Allusion, but Gwen's cousin Sunny is a complete expy of Blackfire, down to having a black-and-purple colour scheme and being voiced by Gwen's VA, Ashley Johnson (In Teen Titans, Blackfire and Starfire shared a VA, Hynden Walch).
In "Ben 10,000 Returns", when Kevin notices the strange fighting styles of the multiverse Ben counterparts under Eon's control, he asks Ben, "Since when did you learn ninjutsu?" Guess who else Yuri Lowenthal voices besides Ben? Sasuke Uchiha.
The Forever Knights KILLED Pierce, probably planned on killing all those aliens waiting for supplies, and Ben needed to threaten to Kill 'em All to make them leave. As in, actually say KILL. Even their appearances and weapons have become Darker and Edgier. And now, most likely Old George will wind up somehow involved with The Lucubra.