Why don’t you just ask one of these big talmidei chachamim outright where the source is for the heter to talk during davening? Tell him “Torah he v’tzorich ani lilmod”.
Because I am non-confrontational. I actually confronted someone about talking during davening a few weeks back and immediately regretted it.
I’m not suggesting a confrontation, just a simple question, as a talmid might ask a rebbe.