... and SYR believes the opposite because they claim natural...

... and SYR believes the opposite because they claim natural graphite is cheaper and that required performance can be achieved at lower cost with a blend with increased natural graphite.
I think in reality we're still finding out, and either way we'll need much more graphite. I suspect graphite stocks performance depends, like all mines, on individual company cost structure and product mix, and how the market diversifies it's supply sources and how quickly the SYR bump is digested.