The bus bar is another story and I see you addressed that in your design.
So, let me see if i got this right?
You are saying that the 2014 NEC addresses two cases w/o addressing the situation that involves both cases...........which is actually the case here and almost always the case.
Case #1 - you have PV backfed at the end of a conductor with no loads added or "addable"
Case #2 - PV at the end of a busbar.
In one case labelling req.s apply,
in the other, the much loved 120% rule (opposite feed then permitted at 120%).
So .....what we have here is a feeder conductor AND a busbar then the PV, so what applies?
It seems we can apply "the larger of the two" breaker req. to limit the feeder and the 120% rule SEPARATELY to the busbar.... - and we are golden?