I heard these already and assessed them. The interviewer asked point blank if the guy heard what was said and he responded with "it was a positive, polite, friendly conversation." That's not an "I heard exactly what was said and here it is ...," it's an observation of how the conversation appeared which implies distance. The interviewer again asked if anything inappropriate was said and the guy does say, "No, not at all. There was a little bit of laughter, obviously a jovial conversation. Nothing untoward for me to actually take notice of what was going on." Wait. If he wasn't taking notice, how could he then have heard everything if he wasn't already taking notice. Again, the guy goes into a descriptive account rather than an "I heard everything" plus was looking for a scene to erupt to determine if Mike had done anything wrong. Again, I keep saying that a scene did not have to take place right then and there and that this was all about what was said, not the appearance of how things were said. Overall, this is a descriptive account of someone not within earshot but just observing an interaction from a distance.
If I'm Marriott's lawyers, the first thing I'm asking him is if he heard all the details of the conversation and to recount them. If not, then I zero in on his "No, not at all." statement to ask how he could make that determination when he didn't hear all the details of the conversation. Another thing the video can show is just how far away these witnesses were to determine if they could have possibly even heard what was said considering how many others were in that lobby and what was going on nearby.