It wouldn't surprise me if SafeChuck's resentment towards Michael is similar to Gavin Arviso. There was a key moment in the 2005 trial when Mez broke with usual defence protocol and asked Gavin 'Why are you so angry with Michael Jackson' and Gavin blurted out 'because he stopped calling me'. Nothing about being abused, kidnapped or exploited. And I believe Safechuck probably felt the same way. In fact his suggestion about being replaced by Brett Barnes suggests as much.
In fact, I think WR is probably suffering from the same syndrome, except in his case it was the estate that stopped calling.