Once Stefan had learned & remembered that Nicole was slipped a mickey that was meant for EJ, it’s wise for him to try again, & then have it happen again, & it worked, especially given that once EJ’s mind is clear he’s going to remember that Stefan had drugged him, given that once EJ’s mind is clear, he will remember as to who was with him at the time they had tea, so was it necessary?
Then this, with it now known by EJ, Stefan, Rolf, Gabi & Rafe, Brady & Eric & Anna that Rolf had brainwashed Stefan for the umpteenth time, is he in any mental capacity to run Di Mera Enterprises, yes, he may not know as to who now knows, but with that many people now knowing, what’s to stop Anna in going to Wei Chin, Li’s father & telling him as what Rolf had done to Stefan, I kind of doubt that Stefan would take the title of CEO, given when Sloan exonerates Shin that would have him to get the CEO position, so wouldn’t drugging EJ be futile?