I know this has been unactive for a year but I feel like I need to explain just in case other people look at this:
They said that to explain why Leo had a new voice actor (personally he sounds like he has a cold). Jason Biggs had other commitments which clashed with his recordings at the time (he had to record all of his parts during Season 1 over the phone as he lived in NY and Nick Studios are in California), so when his filming clashed he was replaced with Seth Green who is good at impersonating people, but not very good at Jason Bigg's voice apparently which ties into explaining the damage to Leo's throat, either so people believe it was planned or to hide the fact that Leo has a new voice actor.