Just looking at the wrecks, the one in the Q race was Chqr, he randomly swerved left for some reason, he could have had some lag on his end maybe.
In the race, the first wreck was again Chqr, he came steaming up behind Jakob then tried swerving around him, straight into Kartmans rear, turning him into everyone else. Apparently Chqr struggles going in a straight line
The next wreck I don't really know what happened, Jakob gets his front right corner on DK's back left which somehow fires DK right into the wall and then he spins back into the pack behind.
Chris was really unlucky, he had all the guys who were pitting early between him and everyone else, so when they pit he was out of the draft
Then on lap 5 T1 Smuffy tried to come down to the low line but Chqr was there so Smuffy was spun out and Chqr lost the draft.
Then lap 6 T1(or T2 for Americans
) Chqr gets up into the wall on exit then spins down across DK spinning them both, nothing suspicious or intentional about it.
Then the first wreck on lap 8, I get lag bumped into Jakob which spins him, then Matty, me, and well practically everyone
Then the final wreck was again lag, at least on my replay, Kartman just went flying forward into Joe and then straight back to where he was, spinning Joe and a few other people.
So from watching all of the wrecks we can conclude one thing. Jakob didn't cause any of them
Oh, and Chqr finds this track difficult