Fact check.
1. The "lady" testified that RH used Bluetooth precisely because he DID have hearing loss, and Bluetooth compensated for the hearing loss because it broadcast throughout the car.
2. The "lady" testified she was aware RH had hearing loss.
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It is a matter of opinion only, not fact, whether or not Cooper was awake and making noise, asleep, or awake and silent. People being "sure" till the cows come home one way or another about Cooper awake or asleep doesn't make opinion fact.
And RH "surely" hearing Cooper depends on Cooper being awake, making noise, making noise loud enough to not be drowned out by a radio on (if it was), and making noise loud enough to be heard by a man with hearing problems in his right ear that couldn't be compensated for in this case by reading lips, filling in conversational blanks, etc.
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The only texts send by RH between walking out of CFA around 9:18 and approx 9:55, 25 minutes after arriving at work, were 3 texts sent at 9:24, most likely while stopped at that intersection, and very likely not with a handheld phone.