The part about the tape is definately made up by you. In the German BBL its mandatory to have at least 2 cameras recording the game. I would be surprised if interested teams wouldn't have it.
Teams have 32 League Games from this year, where he stood on the court over 800 min, or 25 mpg. Add to that 30 games from last year in which he averaged 8 mins. Additionally there is 3rd league footage of him from this and last year, where he avg'd 32.5 min in 31 games. I think that's plenty of footage to see development, strengths and weaknesses.
Regarding the workouts, I think scouts are well aware that he's first time away from home for that long to play ball. Coming into Hoop Summit I don't think he planned to declare this summer already for the draft. There's plenty of interviews where he states his plan to get drafted in 2014. But he took advantage of the situation and got scouts interested, who subsequently have probably watched every footage they could get about him.
But it changed the scenery for him. When the expectations rose after the Hoop Summit he definately had a different situation. When people speculate about you as being the most talented point guard in a draft and lottery pick that creates pressure. I wouldn't rule out that impacted his showings. The first Rockets workout was the beginning of his workout tour, like his dress rehearsal. He failed it reportedly. But if the Rockets have a real plan to get a draftpick why not a second showing? I wouldn't read too much into that except that the rockets seem very interested.
I'd be surprised if he fall that far given his potential. Player with higher uncertainty about their future have been drafted way higher. And NBA personal really likes dreaming. Compare it to Melo. Every fall there's like 15 articles how Melo got the perfect teammate over night who's unselfish and developed passing skills. Comes playoff time, Melo turns into a giant black hole. Every year. I'd be really surprised if Dennis is available at 20.
