If so, are the telepathic abilities of the cetaceans similar to what humans “once” possessed. Will it require the recovery of telepathic abilities on the part of humans before advanced cognitive interaction between the three sentient Earth species can take place?

This is an insightful question because you are quite correct that of the three species, humans are inferior to the dolphins and the whales with regard to intuitive ability and a kind of telepathic awareness of all kinds of knowledge and information that can be obtained readily through the intuitive gateway. But that is quite impaired in human beings so that only a small percentage of the population have a greater than average intuitive reach that sets them apart and allows them to do such things as psychic mediumship and channeling. There are psychics who can receive information from dolphins and whales, both, just as happens with companion animals. One of the best ways to communicate here and now would be through divinely facilitated channeling as your channel here can do. So he is quite able to talk with these creatures should he choose to because he utilizes Creator’s Translator in this way to talk to all kinds of beings, both in the physical and in spirit form, and this can be applied to any species.