Scott's idea was the right one, because this was the mental suggestion Luke had given him.
When they were chatting earlier, Scott had actually 'lost' half an hour, and didn't even know it.
Thus, he didn't know that he had 'exposed' himself on the spot and confessed everything.
Why had the Level 2 clone come? Naturally, it was to preserve Luke's good image.
Also, he was just a small private detective with some money and connections. He had no advantage in negotiating with Scott directly.
On the contrary, after being given a hint, Scott definitely wouldn't be able to act tough in front of the Dark Knight.
Knight was good at offering conditions that the other party couldn't refuse – without such a domineering aura, how could he be a superhero boss?
Scott thought that Luke wanted his body – what he didn't know was that Luke just wanted his equipment.