Channel 9 commentary is unwatchable. Dom clearly has his arm held, on a ball he could have easily caught and brought to ground; it's a clear professional foul, IDK what the refs are supposed to do there. Any other decision is biased.
And yes, Mooney wasn't checked much, but it clearly and significantly changed his lateral movement and prevented him from filling the hole that Hosking goes through.
The rule isn't, "was it a big obstruction?"
Channel 9, mainly because of Gould, is a classic for wanting to throw the rules out for some vague and subjective interpretation of the "spirit of the game". IDK why they do it, to fill dead air with mindless, contrived controversy? But it's actually not good for the game because now the Raiders fans feel hard done by when they weren't.