Maybe I'm missing something, but I just don't quite get the way a bad tackle is used to explain why Origi is now pretty awful (in relative terms), compared to the superstar he was apparently going to become?!
Yes, it was a bad tackle. But not THAT bad in comparison to what goes on throughout a football season. There will be a handful of tackles, if not more, this year in the league which are the same or even worse. Because there are every season.
Origi was out for 25 days and missed 7 games (per Transfermarkt). That's a reasonable chunk of time and enough that it might curtail a run of form and mean a player has to play himself back into good form again. Depending on the character of the person it might even mean that initially they are wary going into a challenge, but seeing as he's only missed three matches in over two years since, one of which was because of flu, you would have thought any lingering fear of contact in the challenge would have long since gone.
He's not a bad player, but looking at his stats he's never scored more than 8 goals in a season (14/15), in 33 appearances that year - 2152 minutes, or 269 minutes per goal. Before the Mori tackle, he'd scored 7 goals for us in 34 appearances - 1457 minutes (208 minutes per goal). Rather than the tackle stopping what was going to be an upward projection of his career, I think it simply stopped a purple patch of form he was on, that a lot of players go through in their careers. Once that spell had ended, he's regressed back to the level he was at for much of the rest of his career (apart from his spell at the World Cup, just before we bought him - another short-term peak).
Even at his best, Origi just doesn't score enough to be a top class striker. He used to put himself about a bit more, but that effort doesn't seem there any more either. You've got a striker who doesn't score enough and doesn't contribute enough off the ball or creating chances for others to outweigh the lack of goals. I'm not surprised we didn't get any takers at the hugely inflated price we were quoting and unless there is an injury crises, I doubt we'll see Divock outside of the League Cup this year - and even that might not happen because I imagine Sturridge will start that one. He'll be gone next summer, either for a much reduced price or on loan somewhere if we still insist on a ridiculous fee.