Look right there is the key. Siakam coming off that screen, Domas switches up into him, and finally, a stop? I have to think that Brown is showcasing Lyles and Metu. There's no other explanation for it. One of them? OK, both? no.
I looked up the 5 man ratings a few games ago and they are odd. There were 3 lineups with Metu/Lyles. One actually had like a mid 80's defensive rating but on the least floor time. I think it was 3 guards around them too. The other two that had more minutes were a 140+ defensive net rating and a 123 or something. Even if you average that out it's TERRIBLE.