All we need to check is if there’s a search committee forming in order to staff his gatekeepers. A Gadol needs to have staff. That staff ensures that he gets all of the information he needs, from whatever the appropriate sources, in order to make the best possible decisions, and then disseminate those decisions to the widest appropriate audience.
If we see that they’re staffing up gatekeeper for Rav Kanievsky, then we’ll know that he’s in a qualified gadol program.