This fits well with my experience too, in an unconfined environment. Sometimes the coops are not far from the chicken spa area, where they all like to hang out after breakfast, separated just by a hedge and shrub border. If a hen gives the call from a coop while they're there, the response sometimes seems to me to be 'We're over here', and after a few such calls, if no-one turns up, the hen walks herself there. They are not in sight of each other through the hedge and border, but the roos are always on guard and I guess they are confident there's no threat in the vicinity either side of the hedge.Many of those who do keep roosters do so in a coop and run environment. Why would a rooster in such conditions respond to an escort call when the hen is only a few feet from him, usually in full sight and there are no other roosters that might want to mate with the hen.
This is what I’ve observed with Henry. He rarely bothers doing much more that a token reply to the escort call because he knows exactly where the hen is and knows that there are no other roosters in the vicinity and the run is safe from predators.
The only times I’ve seen Henry respond to the escort call have been when he’s been on the allotments and the hen not in plain sight. He not only answered but went back to the coop to collect the hen.
If the flock is a long way off, it's obvious from the response call, and the hen waits till someone turns up. Here that someone is usually a subordinate roo, who will invariably want to mate, and the hen/ pullet usually decides whether they do or don't. Venka's clutch last year demonstrated that she was mating both Chirk and Phoenix simultaneously.