[breakintheweb]

I would argue that overstated would be wrong because you could surely overstate his role. "He was the only reason Tesla existed, would be overstating his role.

I think "his role shouldn't be understated" would be the correct phrase given the context.

[neogodless]

I agree with you. Can I blame "first thing in the morning" posting on my error? Either way, I was incorrect and you have corrected me.