In 2 weeks (i think) he is supposed to come back into great plates.

Me too.

But seems it's the way chosed by OG to make him available to non-merged servers.

RNG is a must these days in games. Remember that betting releases dopamine, which is highly addictive, and makes people spend more money for just the chance to get something.

This said, i believe that making him redeemable in events would have caused deep unhappiness to the f2ps. The same players that are, unknowingly perhaps, spending the same resources piecing him in those rng events.

True.

But enexpected surprises deliver a much bigger punch. That's why you see people shouting with joy after winning 5 euros in the lottery and don't care about getting their 3k monthly wage.