How was he forced into something if he didn’t object beforehand? Illidan’s goal and Xe’ra’s prophecy were already the same - Illidan ends the Burning Legion - so there was no puppeteering. Otherwise, Xe’ra trying to moderate a loose cannon like Illidan isn’t exactly villain territory…
If you’re calling the forced Lightforging puppeteering (you’re not the first, so I’ll say here we go again), I’ve already addressed that here;
If a Lightforged Draenei who’s served in the Army of the Light for millennia can use Fel, Lightforing wouldn’t have stopped Illidan from getting his fel crack back. This whole premise of Lightforged warlocks raises plot holes.