Hi everyone, I marked this as spoilers because of the leaks regarding how Piccolo gets his potential unleashed. I don't know if the leaks are confirmed but apparently
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I know the movies barely acknowledge/follow the manga but I think a more creative route to take would be to have Monaito survive the events of the current manga arc and let him teach Piccolo how to achieve the new form. Monaito is an old Namek that never knew of his counterparts living on Planet Namek. It could be that he has Namekian knowledge that the people of Namek never had or that was lost over time. He could even have the Namekian Book of Legends that was mentioned in Battle of Gods but never mentioned again.