"Our progress was initially anything but rapid. Coming from observational and theoretical backgrounds respectively, Mike and I don’t always speak the same language, and would spend hours arguing profusely, only to later realize that we are in fact, saying the exact same thing." (
The search for the planet nine)
Does Mike come from the observational background and "I" (the author) from the theoretical one?
Does the adverb "respectively" refer both to "backgrounds" and to the following-it subjects "Mike" and "I"?