I believe that Mr. Roush (N6JR) was put into a cramped predicament with traffic landing ahead of him. He expressed his doubts to the controller by asking "Is 6JR going to be okay with this?" The controller assured him it was going to work. I am not sure what type was ahead of 6JR, but my guess is that it was a slower aircraft and Mr. Roush recognized pending difficulty as he turned base for final. He stated "I don't think so!"
I listened to a good 3 or 4 minutes of audio before 6JR checks in and heard nothing but dead air. If there was any traffic there's no evidence of it in the feed. Neither did I hear any transmission where the tower tells 6JR to slow down or is told about any traffic. In fact the tower tells him to start his downwind. If was I concerned about a slower aircraft in front of a faster I wouldn't prompt the faster to turn a downwind.
Just BEFORE the controller warns 6JR of caution for traffic ahead upwind (a bit late in my opinion), you can hear an unintelligible transmission which I believe was 6JR stating that he was going around! Reports that 6JR was too slow for his type would also make sense here, considering that I believe he was jammed into a situation where his type was too close behind the slower aircraft landing ahead.
...and another thing that bothers me. When the controller was very tardy in warning 6JR of traffic ahead upwind on the runway, AFTER 6Jr's voicing his displeasure, where did the controller go? It is obvious that someone else took over.
There's 5 seconds from the garbled transmission that sounds like 6RJ is going around and when the controller issues upwind traffic. An aircraft on a upwind leg (parallel to the runway flying the same direction as the runway) wouldn't be a factor to an aircraft making a full stop. I don't know why you seem to think that 6RJ should have been told about it before he stared going around.
I don't hear a change in controller until 2 transmissions after the lake is told to go around which is presumably when 6RJ crashed.
As I stated in my first paragraph I didn't hear anything that would indicate traffic in front of 6JR or 6JR being told to slow down. It seems your respect for Jack Roush has caused you to jump to unnecessary conclusions which are not at all supported by the evidence at hand. A lot is being made of the transmission "is 6JR ok with this?". Honestly I have no idea how any conclusion as to what "this" was can be made given there were only 2-3 transmissions made before it and we can't see what the aircraft was actually doing.
I guess the controller freaked and called for a relief!
He probably went to the restroom to finish wetting himself!
These types of comments given the limited data available are just as inappropriate any which would assume Jack Roush was an incompetent pilot.