People need to calm down here. The way I see it, there are three possibilities:
a) The decision to leave H!P really was made by Megumi, and the pics of her with the guy have no bearing on it whatsoever. The fact that they just recently came out is just really, REALLY bad timing. I mean, Maiha's decision to leave H!P for school came and was made JUST as suddenly as Megumi's decision was. Granted, Maiha allowed for a bit more time to pass before she actually left, thus she could have a graduation concert/ceremony. The fact of the matter is, the announcement for both came and hit us like a ton of bricks, fast and hard. If the pics really are just a coincidence, then we should just accept her decision and wish her the best.
b) The pics were indeed part of (if not) the decision for her to leave. If, as was reported in the first post, Megumi had been having some troubles balancing her school life and her H!P life, then the pics could have been that final straw that helped her make a decision that she may have been planning on making anyway.
c) The pics are the real reason that she's leaving. The school thing is just an excuse and UFW/UFA is cutting her loose to minimize the backlash and save face. In that case, it's the paparazzi's that were the catalyst for this series of unfortunate events.
In the end it's a real shame. As has been said here already, amongst the H!P Kids in general (not just C-ute), Megumi definitely was one of the few that really had the potential to really excel and to make it big. However, what's done is done. Let's just wish her the best in her future endeavours and leave it at that.