I know this isn't that bad an incident, but I don't understand how you can see it the way you do, so will continue, with good intent.
Are we looking at the same replay? On the left-hand turn in the chicane, at the turn in point, Gandlers is fully in front of Bandaska. Bandaska has no overlap at all - his car is behind. By the overtaking rules, he has no right to the inside line of that corner. Regardless, Gandlers
does leave room on the inside - trying to be safe, and
doesn't turn in or squeeze.
Looks like the common case of a driver thinking because he can see a space & is driving towards it, he is already in it & entitled to it.
I'm not saying Bandaska deliberately drove into Gandlers - from his line I'd imagine that was as tight a line as he could manage. However it was in his control to avoid the hit - he really should have lifted off, though there wasn't much time to make that decision. During the crash though, he kept hit foot flat & made no attempt to avoid it. That's the only thing I'd have a problem with.
So, if we had to apportion blame, i'd say 100% Bandaska, and if anyone cares about the whole rules of racing anymore, he should have given that place back.