Sigh.
It. Was. Not. A. Divebomb.
RIC gained time on ROS throughout T1: before the corner he was behind, after the corner he was significantly alongside. Divebombs don't offer that.
If you've toned down to 'just a racing incident with neither to blame', I can accept that (and respectfully disagree, even with the rules on my side), but the divebomb thing needs to stop.
I also accept that a wheel-to-wheel battle is an awkward position for ROS
I don't think "divebomb" is a particularly well-defined term, which is why I've avoided using it until now.
It is regularly used by GT drivers to describe moves made on them by prototypes in WEC races; they're referring to moves where the prototype does not significantly overshoot the corner and does get past, but where they feel it's a late move that risks contact by not giving the driver of the car ahead much time to see the move coming. The danger being that they may already be committed to their line and end up having to lose a lot of time, go over kerbs, or leave the track entirely because the "divebomb" (i.e. the late lunge down the inside) prevents them from turning in.
It's got nothing to do with whether the move works or not. All "divebomb" means in this context is the passing car doesn't get alongside until very close to, or after, the point where the car being passed would normally turn in, so it relies on the car being passed to see the car coming from behind, rather than simply seeing that there is a car alongside him. Or, to put it another way, if the defending car were to take its normal line, it would be hit from behind or hit in the rear quarter, rather than turn into the side of the passing car.
Personally I think it's a stretch to call that particular move a divebomb. RIC's line is much quicker into the corner, and it's much the quickest way to reach the point where contact occurred. It it were a qualy lap and the finish line were placed at the point where the contact happened, everyone would go in tight and deep like RIC did in this instance. ROS's line is, however, much quicker out of the corner, which is why it's the line everyone normally takes. If RIC used a bit more kerb and delayed coming back onto the normal line for a few more metres, the contact wouldn't occur (but he would get worse traction for the run to 2). He could have done that without putting all four wheels off the track, so it's not a case of "why should he" or "ROS must give him space"; ROS did give him space, he just didn't want to use it because he didn't want to compromise his run to turn 2 any more than he already had by running deep into 1. Or, RIC could have avoided the collision by lifting.