How do we know Donald is a real talent?
Because he's performed like one even in the midst of what you're calling systemic failure. He didn't play well tonight, but even the best players have bad days or go through bad stretches.
It's not hard at all to tease out real talent over time. The Rams run real NFL offensive and defensive systems. Not necessarily the systems I would choose, but they are systems good players have played well in for years and years in the NFL. The Rams are anything but innovative, especially on offense, so this is all standard NFL playbook stuff. The overall talent simply isn't what people thought Snisher had created. The QB position, WR position, TE position, OL unit is weak. The LB and DB units are weak. That would be true no matter what system you put them in. Better coaching would help, but wouldn't turn them into something they're not.