Gibbs peak > Lyons peak.
Not sure about this: Lyons is three years younger and is getting better in a more sympathetic system after spending too much time two weeks out of three in the SANFL or in that bloody green vest - meanwhile Gibbs has been on the downhill slide for a year even before he wore a Crows jumper...
You can talk about potential all you like, sadly I don't think Gibbs ever reached his potential peak - or ever will.