And Lex either as part of the Consortium or (more likely) trying to gain entry into it once he hears about it.
Both Cole and Mensa would be candidates for ex-Eureka people - their mental instability would have endangered the community. (Making things go boom is one thing, knowingly endangering the community is something else.)
Hamilton may have thought that working alone was better than working under the eye of the DOD - but Martha might know of him and his work.
Miranda could go either way, someone whose research was cancelled because it didn't pan out or she was just impossible to work with or was caught stealing other people's work
or she was someone who was never invited to move because they thought she was a one-trick pony.
