I honestly don't get why people want to assign ANY blame to Allen on that play. A receiver's job is to catch catchable passes - including those that aren't perfect. The pass wasn't perfect, but was eminently catchable. As you say - the bounce was just bad luck.
I also think too much is made of int off batted pass. That is another fluky bad luck play. Sure sometimes the QB needs awareness of where defenders are etc, but the majority of the time it's just a hand that goes up and it's just bad luck - or a great defensive play. And then for it to be intercepted is basically the definition of fluke - the ball can go ANYWHERE after being deflected. Some people were ranting about how terrible that throw was bc it was deflected. It just happens sometimes. Darnold had five (5) batted passes - but none were intercepted because normally they aren't.