There was plenty of room for them to get by and the ITS car isn't to blame for this. If I was writing an incident report, this is what I'd have put down.
Car 33 dropped 2 wheels to the inside of the curb of the right-hand turn and, upon reentering the pavement, appeared to be out of control. Car 33 then hit car 69, (LF to RR). This upset car 69 and both cars remained in side-to-side contact. Car 69 appeared to have attempted to avoid further contact (by evidence of brake lights) while car 33 did not (note absence of brake lights).
The ITS car, number unknown, left sufficient racing room (2.25 car widths or more) to driver's left for both car 33 and car 69 to navigate the turn. At this point, neither Car 33 or Car 69, made the turn-in for the LH turn. Car 69 was on the brakes well before contact. Car 33 was not.
As the unknown S car attempted to navigate the turn from far DR, the ITB mass struck the unknown car. Immediately prior to contact, car 33 finally applied his brakes.
Moreover, 33 didn't need to hop the curb at the turn. Car 69 left sufficient room for him.
The Z car didn't move over on anybody. Tristan hit Reece and never lifted when he did it. Reece starts to rotate around Tristan's nose and gets on the brakes. They go straight and as the Z car tries to make the turn, they hit him. If the Z car had stayed to the white line on DR, he
still would have been hit - neither Tristan or Reece were going to make that turn. Kee-rist, Reece is point to DR for a left turn and it's entirely because Tristan is rotating him around and not doing anything to keep from picking Reece.
Moreover, if the Z had been that far out, hit have been hit a heck of alot harder because both B cars were going to straight line that turn.