I think at least a few of them will recognize him, but at the same time, there are several Survivor winners apparently playing who all won $1 million compared to Hayden's $500K.
They might not deem him part of the Survivor family, but then again, Kat is. Sounds like they've been together awhile, so he might have already met a few of them on the reunion/appearance circuit as well.
I wonder if there might be a bigger target on several who have already played multiple times, which could have some people thinking they've had their chances already, ie Rupert. I know as fans we're sick of them, but not sure if other players feel that way.