I saw the game, and I can recall CAB missing at least one catchable pass - not a gimme, but certainly catchable. But I don't recall him missing two 'perfect' throws.
I do remember a play where the ball was throw slightly behind CAB and he had to try and twist back to grab it. i.e. - not a perfect throw.
and - if you're going to give Morgan an allowance for throwing a wet ball, then CAB has to get the same allowance for trying to catch a wet ball.
On a wet field, you would think the OC would try to run some safer routes and have check-downs available - but when you run max protect on every play, it limits the number of available receivers.