First I have Obstruction by pitcher. From there I can't say for sure since post not clear enough on what "collides with catcher" means. Was it malicious or not? If malicious, then MC supersedes obstruction and no score and runner ejected.

Ruling sounds wrong. Umpires must have judged malicious to eject. And it is not interference, but obstruction under consideration, and you don't score and eject, unless score happened first. Malicious contact supersedes obstruction.

Not avoiding contact is not a measure of malicious contact. I have never ejected a player for malicious contact after a conference. It happens instantaneously, I know it when I see it.

What don't you like about it? A pitcher has no business in the baseline 2' in front of catcher who is 4' from base nad neither has the ball. There is an OBS rule in OBR.

I was responding to the slight variation where the throw pulled F2 into the runners path and they collided (non-maliciously). That would (generally) be a train wreck in OBR, and would often (but not always) be OBS in FED.

I agree that as described in the OP, F1 was guilty of OBS, and that would be the same in all codes, and that I "like" this portion of the rule.

I suspect that is exactly what the crew in the OP were thinking--they had MC but thought the run scored anyway because of the OBS award. If so, then as others have already demonstrated, the MC should have superceded the OBS, and the run shouldn't have scored.

Understood. And I agree now that I know what you dislike.