But it was trivialized by what Perrin witnessed. The darkness and light affecting Rand were both external to his mind and soul. It's easy to take the further step that Perrin might have had an impact on their relative power.
I very much doubt that. Mind you, I think Veins of Gold was badly written in a number of ways (and that Men Dream Here was entirely superior) but we gather from both POVs that Rand is in Tel'aran'rhiod and finally comes into communion with his previous lives. That's too central to the series to be a mistake (especially if Nynaeve resurrects Rand by ripping him from TAR); just having a chat with Perrin wouldn't be as important as VOG/MDH was meant to be.